A Beginner's Guide to Pool Maintenance Chemicals

Owning a pool in Colorado comes with its own unique set of rules. Our high altitude, intense sun, and hard water create challenges you won’t find in other parts of the country. The powerful UV rays can burn through chlorine quickly, and our mineral-rich water can lead to scale buildup on your beautiful tile and equipment. Generic advice just doesn’t cut it here. This guide is written specifically for Denver-area pool owners, explaining how our local climate impacts your water and what you can do about it. We’ll show you how to adjust your approach to pool maintenance chemicals to keep your water balanced all season long.

Key Takeaways

• Balance is Everything: Your pool's health depends on a team of chemicals working together. Sanitizers keep the water safe for swimming, balancers protect your equipment from damage, and specialty chemicals like algaecides solve specific problems as they arise.
• Follow the Correct Sequence: To avoid wasting time and money, always add chemicals in the proper order. A successful routine involves testing your water first, then adjusting alkalinity, balancing pH, and finally adding your sanitizer.
• Recognize When to Call a Pro: Colorado's climate presents unique challenges, from intense sun to hard water. If you're constantly battling issues like cloudy water, recurring algae, or equipment problems, it's time to call a professional for an expert diagnosis.

What Do Pool Chemicals Actually Do?

Think of pool chemicals as your behind-the-scenes team, working around the clock to keep your backyard oasis perfect. It’s easy to think they just keep the water from turning green, but their job is much more complex. Properly balanced pool chemistry accomplishes three critical tasks at once: it keeps the water safe for swimming, protects your pool’s expensive equipment from damage, and makes sure the water feels comfortable for you and your guests. Getting this balance right is the key to a stress-free pool season.

Keep Your Water Clean and Safe

This is the most important job on the list. Sanitizers are the workhorses of your pool, responsible for eliminating harmful contaminants. The most common sanitizer, chlorine, works tirelessly to kill bacteria, viruses, and other invisible organisms that can cause everything from minor illnesses to serious infections. Without an effective sanitizer, your pool water could quickly become a breeding ground for germs. Maintaining the right level of sanitizer ensures your pool remains a healthy and refreshing place for everyone to enjoy a swim. You can find all the necessary supplies and chemicals to keep your water pristine.

Protect Your Pool Equipment

Your pool’s pump, filter, and heater are significant investments, and pool chemicals play a vital role in protecting them. Water that is improperly balanced can become corrosive or lead to scale buildup. Acidic water can eat away at metal components, vinyl liners, and plaster surfaces, leading to costly repairs. Conversely, water that is too alkaline can cause cloudy water and scale deposits that clog your plumbing and filter. Water balancers help create a stable environment, preventing corrosion and ensuring your sanitizers work effectively. Proper chemistry is your best defense against premature wear and tear on your pool equipment.

Ensure Swimmer Comfort and Safety

Have you ever jumped into a pool and come out with red, itchy eyes or dry skin? That’s often a sign of imbalanced water, not just too much chlorine. The pH level of your pool water should be close to the natural pH of the human eye, which is why the ideal range is between 7.2 and 7.6. When the pH is in this sweet spot, the water feels silky and comfortable. It also allows your chlorine to work at peak efficiency. Consistent cleaning and maintenance helps keep your water perfectly balanced, so every swim is a pleasant one.

The Must-Have Chemicals for Your Pool

Walking down the chemical aisle can feel overwhelming, but keeping your pool water balanced is simpler than you think. Think of it like building a recipe; you have your core ingredients that you'll use all the time, and then a few special ones you'll pull out for specific situations. Getting to know these key chemicals is the first step toward a sparkling clean and safe swimming experience.

Sanitizers: Your First Line of Defense

Sanitizers are the workhorses of your pool, responsible for keeping the water free of harmful bacteria and other contaminants. Chlorine is the most common and effective sanitizer, working to kill germs that can make swimmers sick. You can find it in slow-dissolving tablets, fast-acting liquid, or quick-dissolving granules. The goal is to maintain a steady chlorine level between 1.0 and 4.0 parts per million (ppm). You'll also need a pool shock, which is a strong, concentrated dose of sanitizer. You use shock to give your pool a deep clean after a party, a storm, or anytime the water looks a little murky.

Water Balancers: pH, Alkalinity, and Calcium

Think of water balancers as the foundation of your pool's health. They create a stable environment where your sanitizer can work effectively, and they also protect your pool's surfaces and equipment from damage. The three main players are pH, alkalinity, and calcium hardness. You’ll use products to adjust pH up or down to keep it in the ideal 7.4 to 7.6 range. Total alkalinity acts as a buffer to prevent wild pH swings. Finally, a calcium hardness increaser prevents soft water from corroding plaster and other surfaces. Proper cleaning and maintenance always starts with balanced water.

Stabilizers: Shielding Chlorine from the Sun

Here in Colorado, the strong sun can be tough on your pool's chlorine levels. A stabilizer, also known as cyanuric acid (CYA), acts like sunscreen for your chlorine. It forms a weak bond with chlorine molecules, preventing the sun's UV rays from breaking them down too quickly. Without a stabilizer, you could lose most of your chlorine in just a few hours on a sunny day. This means you'd be using far more chlorine than necessary, which costs you time and money. Using a stabilizer helps your sanitizer last longer and work more efficiently, which is essential for any outdoor pool.

Specialty Chemicals: Algaecides, Clarifiers, and Shock

Even with perfect balancing and sanitizing, you might run into specific issues. That's where specialty chemicals come in. Algaecides are your go-to for preventing and killing algae blooms, especially the stubborn green, yellow, or black varieties. If your water is cloudy but your levels are balanced, a clarifier can help. It works by clumping together tiny particles that are too small for your filter to catch on its own, making them large enough to be filtered out. And as mentioned before, shock is a multi-purpose problem solver, great for clearing up cloudy water and getting rid of combined chlorine (chloramines) that cause that "pool smell."

How to Add Pool Chemicals: A Step-by-Step Guide

Adding chemicals to your pool might seem like a complex science experiment, but it’s really a straightforward process once you get the hang of it. The key is to follow a specific order to make sure each chemical can do its job effectively without interfering with the others. Always read the manufacturer’s instructions on the product label, as dosages will vary based on your pool’s size and the chemical’s concentration. By following these steps, you can keep your pool water balanced, clear, and ready for swimming.

Step 1: Test Your Water

Before you add anything to your pool, you need to know what’s already in it. Testing your water is the essential first step to achieving perfect balance. You can use simple test strips or a more comprehensive liquid test kit to get a snapshot of your pool’s current chemical levels. Regular testing helps you understand what your water needs, preventing you from adding unnecessary chemicals or guessing at dosages. We recommend testing at least once a week to stay on top of things. If you need reliable testing supplies, we offer professional-grade supplies and chemicals to give you an accurate reading every time.

Step 2: Adjust Alkalinity

Think of total alkalinity as the anchor for your pool’s pH. It helps keep the pH level steady and prevents it from swinging wildly. The ideal range for total alkalinity is typically between 80 and 120 parts per million (ppm). If your test shows the alkalinity is low, you’ll use an alkalinity increaser to raise it. If it’s too high, a pH decreaser (like muriatic acid or dry acid) will lower it. Always adjust your alkalinity before you touch the pH, as balanced alkalinity makes it much easier to lock in the correct pH level afterward.

Step 3: Balance pH Levels

After your alkalinity is in the right range, it’s time to balance the pH. The pH level measures how acidic or basic your water is, and it directly affects swimmer comfort and the effectiveness of your chlorine. The ideal pH is between 7.2 and 7.6. If your pH is too low (acidic), it can cause skin and eye irritation and corrode your pool equipment. If it’s too high (basic), it can lead to cloudy water and reduce your chlorine’s sanitizing power. Use a pH increaser (like soda ash) to raise the level and a pH decreaser to lower it.

Step 4: Add Sanitizer

With your water balanced, you can now add your sanitizer. Sanitizers, most commonly chlorine, are what keep your pool water free of harmful germs and bacteria. Chlorine’s job is to actively kill contaminants, ensuring your pool is safe for everyone to enjoy. You can add chlorine in several forms, including tablets, granules, or liquid. The goal is to maintain a consistent free chlorine level, usually between 1 and 3 ppm. Failing to maintain this level not only makes the water unsafe but can also strain your pool’s filtration system, potentially leading to a need for equipment repairs and servicing.

Step 5: Use Specialty Chemicals as Needed

Sometimes, your pool needs a little extra help to look its best. That’s where specialty chemicals come in. These are not part of your daily or weekly routine but are used to solve specific problems. For example, if you spot the beginnings of green, black, or yellow growth, an algaecide will stop it in its tracks. If your water looks hazy or cloudy, a clarifier will help by grouping tiny particles together so your filter can easily remove them. Shock treatments are another specialty chemical, used to quickly raise chlorine levels to clear contaminants. If you find yourself constantly fighting these issues, it might point to a larger problem that our cleaning and maintenance team can help diagnose.

How Does Colorado's Climate Affect Your Pool Chemistry?

Living in Colorado means we get to enjoy beautiful, sunny days, but our unique environment also brings some specific challenges for pool owners. The altitude, intense sun, and even our local water quality can throw your pool chemistry off balance. It’s not just you; your pool is working harder here than it would in other parts of the country. Understanding these local quirks is the first step to staying ahead of them and keeping your water crystal clear all season long. Think of it as learning the local rules for pool care. Once you know what to look out for, managing your pool becomes much simpler.

High-Altitude Sun and Chlorine Burn-Off

One of the best parts of living in Denver is the sunshine, but our high altitude means the sun's UV rays are much more intense. This powerful sunlight is great for getting a tan but tough on your pool's chlorine. The UV radiation essentially "burns off" the free chlorine in your water at a much faster rate. This means you might test your water, find the chlorine level is perfect, and then discover it’s too low just a day later. To counteract this, you’ll need to test your water more frequently and may need to add chlorine more often or use a stabilizer (cyanuric acid) to protect it from the sun.

Drastic Temperature Swings

Colorado weather is anything but predictable. A hot, 80-degree afternoon can quickly turn into a cool 50-degree evening. These drastic temperature swings don't just affect your wardrobe choices; they also impact your pool's water chemistry. Warmer water encourages algae growth and causes chemicals to be used up faster, while cooler water can change how chemicals dissolve and react. This constant fluctuation means your pool's chemical needs can change from one day to the next. Consistent testing is key, especially during the spring and fall. A regular cleaning and maintenance schedule can help you stay on top of these changes without the headache.

Denver's Hard Water and Mineral Content

Denver is known for having "hard" water, which simply means it has a high concentration of dissolved minerals like calcium and magnesium. While this isn't harmful to drink, it can cause problems in your pool. High calcium levels can lead to cloudy water and the formation of "scale," a crusty white deposit that builds up on your pool surfaces, waterline tiles, and inside your equipment. This scale isn't just an eyesore; it can clog filters and damage your pump, leading to costly fixes. Managing hard water requires specific chemical adjustments to prevent scaling and keep your pool looking its best. If you notice scale buildup, it's important to address it before it causes bigger equipment repair issues.

Do Your Pool's Chemical Needs Change Seasonally?

Yes, your pool's chemical needs definitely change with the seasons. Think of it like tending a garden; what it needs in the spring is very different from what it needs in the summer or winter. The amount of sunlight, the water temperature, how often people are swimming, and even the debris that falls into your pool all shift as the seasons turn. Here in Colorado, where we experience four distinct seasons, this is especially true.

Seasonal pool care is all about anticipating these changes. In the spring, you’re focused on waking your pool up after a long winter. During our hot, sunny summers, the main goal is keeping the water sanitized and clear despite heavy use. And in the fall, you’re preparing the pool for its winter hibernation to protect it from the cold. Following a seasonal maintenance plan helps keep your water sparkling and your equipment in great shape year-round. It’s the best way to ensure your pool is always ready for fun when you are.

Getting Your Pool Ready for Spring

When the weather starts to warm up, it’s time to get your pool ready for swimming season. After being covered all winter, your pool water will need a serious refresh. The first step is usually a shock treatment to eliminate any algae or bacteria that may have grown in the dormant water. From there, you’ll need to test and balance everything. This means adjusting the pH, total alkalinity, and calcium hardness to get them into their ideal ranges. Getting these levels right from the start makes your sanitizer work more effectively and prevents issues like cloudy water or scaling later on. A proper spring opening sets the foundation for a hassle-free summer of swimming, and if you need a hand, our team offers professional cleaning and maintenance to get it done right.

Maintaining Your Pool in the Summer

Summer is when your pool chemistry gets a real workout. The intense Colorado sun, warmer water, and frequent swimmers all increase the demand for sanitizer. Chlorine, in particular, gets broken down by UV rays, so you’ll find yourself adding it more often to maintain a safe level. This is also when you’ll be extra thankful for cyanuric acid (stabilizer), which protects your chlorine from the sun. With more people in the pool, contaminants like sunscreen and sweat can build up, so you may need to shock the pool more frequently to keep the water crystal clear. The increased demand of summer is why many pool owners consider automated dosing systems to help keep chemicals balanced without constant manual adjustments.

Preparing Your Pool for Fall and Winter

As swim season winds down, your focus shifts to protecting your pool during the cold months. Properly winterizing your pool prevents damage from freezing temperatures and makes your spring opening much easier. Before you put the cover on for the last time, you’ll want to balance the water chemistry one final time. Then, you’ll add a winterizing chemical kit. These kits typically contain a slow-release algaecide to prevent growth and a stain preventative to keep surfaces clean. Taking these steps ensures that when you pull back the cover next spring, you won’t be greeted by a green, swampy mess. If you’ve had issues with winter damage in the past, it might be a good time to think about remodels and rehabs to strengthen your pool for the future.

What's the Average Cost of Pool Chemicals?

Figuring out a budget for pool chemicals can feel a little mysterious at first, but it’s mostly about covering your core needs and then adding a little extra for occasional treatments. The total cost will depend on your pool's size, how often you use it, and our unique Colorado weather. Think of it in three main categories: the essentials you’ll buy regularly, the balancers you’ll use as needed, and the specialty chemicals for specific problems. Planning for these expenses helps make your weekly cleaning and maintenance routine smooth and predictable, so you can focus more on enjoying your pool and less on surprise costs.

Budgeting for Sanitizers and Shock

Sanitizers are the most important, non-negotiable part of your chemical budget. Chlorine is the star player here, as it kills bacteria and other contaminants that can make swimmers sick. You can find it in tablet, liquid, or granular form. You'll also need to budget for pool shock, which is a concentrated dose of sanitizer used to deep clean the water after a party, a big storm, or whenever it looks a bit murky. Your goal is to keep a consistent chlorine level between 1.0 and 4.0 parts per million (ppm). Since these are used constantly, they will be your most regular chemical expense.

The Cost of pH and Alkalinity Balancers

Next up are your water balancers. These chemicals keep your water comfortable for swimmers and protect your pool equipment from corrosion or scaling. The two main players are pH and total alkalinity. Your pool’s pH should stay between 7.2 and 7.6. If it’s too low, you’ll use a pH increaser like soda ash; if it’s too high, you’ll use a decreaser like muriatic acid. Total alkalinity acts as a buffer to keep the pH stable, ideally between 80 and 120 ppm. You’ll use these chemicals less frequently than sanitizer, only adding them when your water tests show they are out of balance.

Factoring in Algaecides and Clarifiers

Think of algaecides and clarifiers as your problem-solvers. You won’t need them every week, but it’s smart to have them on hand. Algaecides are your best defense against algae blooms, working alongside chlorine to stop and prevent growth. Clarifiers come to the rescue when your water is cloudy. They work by binding tiny particles together into larger clumps that your filter can easily catch, restoring that crystal-clear look. The cost for these is occasional, so you can factor them into your budget as a "just-in-case" expense for keeping your water pristine.

Where to Get Quality Pool Supplies in Denver

When it comes to buying chemicals, quality makes a huge difference in performance and safety. While big-box stores offer convenience, sourcing your products from a dedicated pool professional ensures you get high-grade, reliable chemicals that work. At Neptune Pools, we provide professional-grade supplies and chemicals from trusted manufacturers. As your local Denver experts, we can also give you advice tailored to our climate, from dealing with hard water to combating the effects of high-altitude sun. This ensures you get the right products for your pool’s specific needs, saving you time and money in the long run.

Common Pool Chemical Mistakes (and How to Avoid Them)

Taking care of your pool’s chemistry can feel like a science experiment, and it’s easy to make a few mistakes along the way. The good news is that most common slip-ups are simple to fix and even easier to avoid once you know what to look for. Getting your water chemistry right isn't just about having a crystal-clear pool; it's about ensuring the water is safe for swimmers and protecting your pool's surfaces and equipment from damage.

Let's walk through some of the most frequent chemical mishaps pool owners face. From adding too much of a good thing to forgetting basic safety rules, a little knowledge can save you a lot of time, money, and frustration. Think of this as your cheat sheet for sidestepping common issues and keeping your pool in perfect shape all season long. By understanding these points, you’ll be able to manage your pool with confidence.

Using Too Much Chlorine

Chlorine is your pool’s best friend for killing germs, but you can definitely have too much of a good thing. The goal is to keep your chlorine levels between 1.0 and 4.0 parts per million (ppm). When you add too much, you’re not making the water "extra" clean. Instead, you’re creating a harsh swimming environment that can cause red eyes, itchy skin, and even damage swimsuits and pool liners over time.

To avoid this, always test your water before adding more chlorine. Add the chemical in smaller, measured doses based on your test results and your pool's volume. It’s much easier to add a little more later than it is to deal with the effects of over-chlorination.

Skipping Regular Water Tests

Guessing your pool’s chemical levels is a recipe for problems. Clear water doesn't always mean balanced water. Without regular testing, you won't know that your pH is off or your sanitizer levels are dropping until you have a bigger issue on your hands, like cloudy water or an algae bloom. Think of testing as a regular health check-up for your pool.

Get into the habit of testing your water at least once a week using test strips or a liquid kit. For a more detailed and accurate analysis, you can rely on professional cleaning and maintenance services. Consistent testing allows you to make small, proactive adjustments instead of having to react to major, costly problems down the line.

Adding Chemicals in the Wrong Order

Did you know there’s a correct order for adding chemicals to your pool? If you add them randomly, you could end up wasting time and money as one chemical counteracts another. The proper sequence is essential for getting stable, balanced water efficiently. Always adjust your total alkalinity first, then your pH, and finally, your sanitizer (chlorine).

Total alkalinity helps stabilize your pH, acting as a buffer to prevent wild swings. If you adjust your pH before your alkalinity is in range, you’ll likely have to adjust it again. Following the right order ensures each chemical can do its job effectively. You can find all the right balancers and sanitizers in our shop for supplies and chemicals.

Forgetting Chemical Safety and Storage

Pool chemicals are powerful compounds that require careful handling. Forgetting basic safety protocols can lead to dangerous reactions or personal injury. Always store your chemicals in a cool, dry, and well-ventilated area, away from direct sunlight and out of reach of children and pets. Keep them in their original, clearly labeled containers with the lids sealed tightly.

When handling chemicals, wear protective gear like gloves and safety glasses. Never mix different chemicals together, as this can create toxic fumes or even cause a fire. Use a separate, clean scoop for each chemical to prevent cross-contamination. These simple steps are crucial for keeping everyone safe while you maintain your beautiful pool.

How to Choose High-Quality Pool Chemicals

Walking down the pool chemical aisle can feel overwhelming. With so many bottles, buckets, and brands, how do you know which ones are right for your pool? The truth is, not all chemicals are created equal. Choosing high-quality products isn't about spending more money; it's about making your maintenance routine more effective and preventing frustrating problems like cloudy water or stubborn algae. Investing a little time to understand what you're buying will save you time, money, and headaches all summer long.

Professional-Grade vs. Retail Options

You’ve probably noticed that you can buy pool chemicals at big-box stores or from a dedicated pool supply company. The main difference often comes down to professional-grade versus retail-grade options. Professional-grade chemicals are typically more concentrated and contain fewer fillers. While a retail product might seem cheaper upfront, you may need to use more of it to get the same result, costing you more in the long run. The growing demand for effective swimming pool chemicals shows that more pool owners are recognizing the value of quality. When you choose professional-grade products, you're investing in efficiency and better results for your water.

What to Look for on the Label

The label on a chemical container is your best friend. Before you put anything in your cart, take a moment to read it carefully. Look for the list of active ingredients and, more importantly, their concentration percentages. A higher concentration of the active ingredient generally means the product is more powerful and effective. The label will also provide crucial dosage instructions and safety warnings. Following these directions is key to keeping your water balanced and your swimmers safe. Understanding the label helps you make an informed choice, especially with the rise of multi-functional chemicals designed to simplify your maintenance routine.

Why Concentration and Purity Matter

Concentration and purity are the two most important factors in a chemical's performance. A highly concentrated product means a little goes a long way, giving you more value per bottle. Purity is just as critical. Low-purity chemicals often contain fillers or contaminants that can make your water cloudy, leave behind residue, or fail to solve your problem. Users of high-quality products often report noticeably clearer water simply because the chemicals are purer and more effective. Getting your pool supplies from a trusted expert ensures you get pure, properly concentrated products and the right advice on how to use them.

When Is It Time to Call a Pool Pro?

Taking care of your own pool can be incredibly rewarding. There’s a real sense of pride in keeping your water crystal clear and ready for a swim. But let’s be honest, sometimes your pool can throw a curveball that even the most dedicated DIY-er can’t solve with a trip to the supply store. Knowing when to call in a professional isn’t admitting defeat; it’s a smart move that can save you time, money, and a lot of frustration. Certain issues go beyond basic chemical adjustments and require an expert eye and specialized tools. If you find yourself in over your head, a certified technician can diagnose the problem quickly and get your pool back to perfect condition, letting you get back to enjoying it.

When Water Chemistry Won't Cooperate

Are you constantly fighting cloudy water, or does algae keep making an unwelcome return no matter what you do? If you feel like you're stuck in a cycle of testing and adding chemicals without seeing results, it’s time for a professional opinion. Persistent water balance issues can point to a deeper problem that a standard test kit won't reveal. A professional can perform advanced diagnostics to identify the root cause, whether it's a filtration issue or a stubborn contaminant. Getting an expert to handle your pool’s cleaning and maintenance can break the cycle and restore your water to a safe, clear state.

Strange Noises or Broken Equipment

Your pool equipment is the heart of your system, and when it starts acting up, it can bring everything to a halt. If you hear grinding noises from your pump, your heater isn't working, or your filter pressure is always high, don't ignore it. Pool equipment involves a tricky combination of water, high pressure, and electricity, making DIY repairs risky. A certified technician can safely diagnose the problem and perform the necessary equipment repairs. Trying to fix it yourself could lead to more extensive damage or even create a safety hazard, so it's best to leave these jobs to someone with the right training.

Cracks, Leaks, or Other Structural Issues

Have you noticed a crack forming in your pool’s plaster, a tile that’s fallen off, or is the water level dropping faster than evaporation can explain? These are signs of potential structural problems that need immediate attention. A small leak can quickly worsen, leading to significant water loss, ground erosion, and costly damage to your pool's foundation. A professional can pinpoint the source of a leak and address any structural weak points before they become major issues. If your pool is showing its age, it might even be time to consider a remodel or rehab to restore its integrity and appearance.

Frequently Asked Questions

My eyes burn after swimming. Does that just mean there's too much chlorine? Not necessarily. While very high chlorine levels can be irritating, that stinging sensation is more often caused by an improper pH balance. When your pool's pH is too low (acidic) or too high (alkaline), it can cause discomfort for swimmers. It can also be a sign of chloramines, which are compounds that form when chlorine combines with contaminants like sweat and oils. The best first step is to test your water to see if your pH is outside the ideal 7.2 to 7.6 range.

How often do I really need to test my pool water? Testing your water at least once a week is a great rule of thumb for routine maintenance. However, you should plan to test more frequently after specific events. For example, it's a good idea to test your water after a heavy rainstorm, a big pool party with lots of swimmers, or during a particularly hot stretch of weather. These situations can change your water chemistry quickly, and more frequent testing helps you stay ahead of any potential problems.

Why is my water cloudy if my chlorine level is normal? Cloudy water is a common frustration, and it can have several causes even when your sanitizer level seems fine. The most frequent culprit is an imbalanced pH or alkalinity level, which can reduce your chlorine's effectiveness and cause particles to fall out of suspension. It could also be due to very fine debris that your filter is struggling to catch. In that case, a water clarifier can help by clumping those tiny particles together so your filter can remove them.

Is it okay to just buy the cheapest chemicals I can find? While it can be tempting to grab the cheapest option, the quality of your chemicals really does matter. Lower-cost chemicals are often less concentrated and may contain fillers that can add unwanted substances to your pool, sometimes even making cloudiness worse. Using a higher-quality, professional-grade chemical often means you use less product to achieve the same result, which can be more cost-effective in the long run and give you a cleaner, clearer pool.

I added chemicals, but my levels are still off. What did I do wrong? This can happen if chemicals are added in the wrong sequence. For stable results, you should always adjust your total alkalinity first, as it acts as a buffer for your pH. Once your alkalinity is in range, you can adjust the pH. Your sanitizer, like chlorine, should be added last. If you follow this order and still struggle to get the water balanced, it might be a sign of a more complex issue, and it could be a good time to get a professional opinion.