Ultimate Guide to Lower pH in Your Pool | PoolAuthority

How To Best Lower pH In A Pool


Having your own personal swimming pool is a fantastic luxury, but also requires extensive attention and maintenance. Pool water can often get an unbalanced pH level, and when the pool pH is too high, swimming is uncomfortable and unsafe. Achieving a lower pH in your pool may seem like a hassle, especially if you are unsure of how to best fix the problem. Luckily, there are many great products on the market today to combat a high pH in a pool. Different products are used in different ways, so it is important, to begin with a clear idea of what your pool requires. Once you have tested the pH level of the water in your pool, you can start to find the best product to fit your needs. Read on for an extensive guide on the currently available products for lowering the pH level in your swimming pool, as well as helpful tips to safely and efficiently obtain balanced pool water. With the right maintenance, swimming in your pool can be a fun and pleasant experience. If you need to increase it, see our resource on raising the pH in your pool.



Feature 1

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Omni pH Decreaser


Safer to handle than
liquid acids

Arch Chemical 61302


For use in pools
or spas

Pool PH Reducer


Also works in
salt water pools

Pool Basics 2302PB


Prevents scaling,
deposits of calcium, and
cloudy pool water

Leisure Time Spa Down


Compatible with
all sanitizers

Kem-Tek KTK-50-0010


Safe for all
pool surfaces

Aqua Chem pH


Protects pool
equipment and surfaces

In The Swim Pool pH Reducer


Packaged in
convenient pail

GLB 71242A pH Down Sanitizer


Prevents staining,
scaling, and clouding

Pacifi Clear F084006048pc


Safer than
muriatic acid

Different Types Of Products

All of the products available to maintain an ideal pH water balance consist of some type of swimming pool acid. While it may seem dangerous to add acid to a swimming pool, it is the only way to lower the pH level. Manufacturers often use one of two main chemicals to create these products: sodium bisulfate and muriatic acid. A few products utilize sulfuric acid as an alternative to muriatic acid. These chemicals are used differently, and it is important to know which one you are using. Also, choose just one of the chemicals; do not mix them. Each chemical and their individual properties are detailed below.

Sodium Bisulfate

Sodium bisulfate is an effective chemical to bring out a lower pH in pools. Unlike muriatic acid, sodium bisulfate is a dry acid, meaning that it comes in powder form. The power dissolves in the pool water, normally within 10 minutes. However, you should wait several hours to retest the pH of the water, to give the dry acid enough time to work. The powered property of sodium bisulfate makes it safer than liquid acid, because while dry acid will irritate skin and damage clothing, it does not have the same instant and intense burning effect of liquid acid. Sodium bisulfate is also easier to store than muriatic acid, which must be kept with extreme care in order to prevent dangerous leaks and other accidents.

You will sometimes find that pool maintenance products vary as far as the percentage of sodium bisulfate they contain; this percentage will determine the amount of acid you will need to apply to your pool. Also, some products should be diluted before use. Sodium bisulfate lowers water alkalinity as well as pH and diluting it is sometimes necessary in order for the chemical to have the desired pH-lowering effect.

Muriatic Acid

Adding muriatic acid to pool water is another way to lower the pH level. Many people try to avoid treating their pools with this acid, as it is a hazardous process requiring extensive safety precautions. However, muriatic acid is one of the most common ways to combat a pool pH that is too high. It will circulate throughout the water shortly after being poured in, and even a small amount of the acid will be effective within a few hours. Muriatic acid is corrosive, with a damaging effect on skin, clothes, and surfaces, even concrete. Pool equipment like filters and pumps can become damaged if this acid comes into direct contact with them. Dilute the acid before you use it, (if the manufacturer has not diluted it already), and wear protective gear to cover your skin and eyes. The fumes emitted by muriatic acid are also harmful when inhaled, so wear a safety mask and ensure the area you are working in has ample ventilation.

Muriatic acid must be stored with care. Make sure that the container is tightly sealed and in a secure, ventilated area away from children or pets. The acid should be stored away from sources of heat.

Sulfuric Acid

Sulfuric acid is occasionally used as an alternative to muriatic acid. Many find this type of acid preferable because it does not produce harmful fumes. Sulfuric acid can effectively lower the pH in pool water. However, this type of acid will also add sulfates to the water, which are not only unnecessary but can cause problems as you continue to use acid. Consider your own individual preferences to decide if a sulfuric acid-based product could be the right choice for you.


There is a large assortment of different brands currently offering great products to lower high pH levels in pools. Below are five of the most popular and highly rated brands on Amazon, each with their own approach to excellent pool maintenance.


OMNI is a large and trusted brand of pool maintenance products. Manufactured by BioLab, Inc., OMNI’s range of products focus on safety and efficiency to create products which will ensure the best possible conditions in your pool. This brand’s products cover all of the major facets of pool care, from algae eliminators to sanitizers and oxidizers. OMNI also puts out a top-notch line of balancers, including some great pH decreasers. Emphasizing convenience, OMNI products seek to simplify the work that goes along with owning a pool. Their straightforward and highly effective products consist of the highest quality materials available. OMNI tests each and every one of their products, so you can be confident as you use them in your pool.

OMNI is not only a great source of pool products. This brand is also a great resource for pool maintenance information. Putting safety first, OMNI provides extensive pool care tips and information, ensuring that your pool water will be as safe and pleasant as possible.


HTH is a leading pool water treatment company. Having gotten their start in 1928, HTH offers top-grade products to help you test, treat, and enjoy your pool with ease. HTH has formulated a four-step process for achieving clear, sparkling, and safe pool water, with balancing being the first step. Coming in a variety of sizes and weights for your unique needs, HTH’s pH decreasers are trusted to balance the pH level in your pool and curb the negative effects of a pool pH that is too high. Many of HTH’s products are even safe to use with salt water pools.

HTH is one of many brands manufactured by Lonza, one of the largest suppliers of water treatment chemicals in the world. Since 2011, Lonza has been the leading supplier of pool and spa water sanitizers on the global scale; HTH’s line of chlorine-based water sanitizers is recognized all over the world.


Kem-Tek got its start in 1958 packaging dry chlorine and has since expanded into a trusted, widely-known brand of pool and spa care products. This brand boasts its specialized 1-2-3 system; a fast, easy strategy for achieving clean, safe pool water. Balance is the first step in this process, and Kem-Tek’s pH Minus products are designed to decrease pH in pool water in a safe, simple way. The entirety of this brand’s products feature straightforward labeling and color-coding to prevent confusion and accidents, as well as to achieve the desired result as quickly and efficiently as possible. Online you will find “Material Safety Data Sheets” for each Kem-Tek product. These informational resources will educate you on all you need to know about the ingredients in each product, as well as any hazards to be wary of during use. Kem-Tek’s products are also all salt-system compatible.

In The Swim

In the Swim is a great supplier of discount swimming pool supplies, offering an extensive range of products including: cleaning chemicals; all types of equipment including pumps, heaters and filters; accessories like lights, slides, and diving boards; covers for leaves, winter months, etc.; and floats, toys, and games. Established in 1982, In the Swim began as a small operation out of a husband and wife team’s garage. Now, this popular company is backed by over thirty years of experience and puts out dependable, affordable products for all of your swimming pool needs. In the Swim’s sweeping array of discount inventory is unparalleled by others in the market; the company introduces new products to the stock every season.

In the Swim offers an extensive range of water balancers, including a top-rated and competitively priced pool pH reducer. Whether you are new to the swimming pool ownership scene or have been maintaining a pool for years, In the Swim is an excellent pool equipment company to purchase from.


Trusted by both public organizations and personal pool owners, PacifiClear has maintained a reputation for providing safe, high-quality water chemicals over the past ten years. With a focus on efficiency, PacifiClear ensures proper care of your pool water by offering a service to precisely calculate the correct dose of chemicals for your pool. This useful benefit lessens the risk of pool acid overdose while making sure that your swimming water is as clean as possible. PacifiClear’s selection of pool care chemicals includes balancers, sanitizers, shocks, algaecides, and a variety of specialty products for specific needs. Among its line of balancers is a pH Minus product, which is proven to lower high pH in your pool, making the water safe and enjoyable for swimmers. You can feel confident that this US-based company will fulfill your pool maintenance needs with care and expertise.

Top 5 Products To Lower pH In A Pool

As you begin the search for the best pool water pH decreaser for you, you will find that there is a wide variety of products to choose from. With so many options, it can be difficult to know which product will fulfill your unique needs. Below are five of the best pH-lowering products on Amazon. Each choice has its own individual qualities and benefits; review each product carefully to determine the right selection for your pool.

1. Omni pH Decreaser

The Omni pH Decreaser makes it to the top of this pool care product list with a five star rating from Amazon.com. This product provides eight pounds of pH-decreasing chemical; an excellent value. Consisting of 93.2% sodium bisulfate, this pH decreaser is a granular chemical. This means that it is significantly safer than liquid acids, which require extreme caution when handling. The Omni pH decreaser will decrease the pH level of your pool water slowly, ensuring that the water will become perfectly balanced. The results from this product will also allow for algaecides to work correctly, as well as keep your pool surfaces and equipment in top condition.

Conveniently packaged in a container with a handle for easy transport, the pH decreaser for Omni will ensure ideal pool conditions for an affordable price.

2. Arch Chemical 61302 HTH pH Minus

This fantastic product from HTH boasts an impressive 4.5 out of 5 star rating on Amazon.com, and offers seven pounds of pH-lowering chemicals. Great for both pool and spa owners, this product is one of the only options available from a leading brand that consists of sulfuric acid. Sulfuric acid is a pool acid alternative to muriatic acid; it produces fewer fumes and, is therefore, preferable for many pool owners.

The Arch Chemical 61302 HTH pH Minus has made it near the top of this list for its popularity, competitive price, and the trusted brand behind it. If you are looking for a safe substitute for muriatic acid in your pool, you may want to consider this highly rated product.

3. Pool pH Reducer

If you are looking for a quality pH-lowering product in bulk, this popular choice sold on Amazon could be for you. For pool owners consistently struggling with their pool pH being too high, this product’s 25 pound weigh. The beginning dose is 15-30 ounces of product for every 10,000 gallons of pool water.

This pool care product from EcoClean Solutions is non-toxic and biodegradable, as well as compatible with salt water pools. It consists of concentrated granular sodium bisulfate, meaning that it is much safer to apply than muriatic acid. To understand scale, know that ten pounds of this granular product are equivalent to one gallon of muriatic acid. Conveniently packaged in a sturdy pail with a handle, this pH decreaser is also simpler to store than muriatic acid.

​The 25-pound Pool pH Reducer boasts a rating of 4.4 stars on Amazon, and is manufactured in the United States.

4. Pool Basics 2302PB pH Lower For Swimming Pools

Awarded 4.8 stars on Amazon, this Pool Basics product is recommended by multiple enthusiastically positive customer reviews. Pool Basics is a popular brand with products manufactured by Robelle Industries, a long-standing producer of swimming pool maintenance products. The Pool Basics pH reducer is intended for use in pool water that is higher than the optimal pH range of 7.2 ppm to 7.8 ppm. It will not only lower the pH level but also allow other important chemicals, such as algae killers, to function properly. Also, this pH-lowering chemical will manage scaling, discourage the formation of calcium deposits, and keep your pool water crystal clear.

This Pool Basics product supplies 2.5 pounds of tested product. It works quickly, is gentle on your pool surfaces, and won’t cause itchy skin for swimmers.

5. Leisure Time Spa Down

This granular pH-lowering chemical is a bestseller, with an average of 4.6 stars across 152 customer reviews on Amazon. Leisure Time has been the leader in spa water maintenance for over 25 years, producing affordable and effective products for consumers everywhere.

When the pH level of your pool or spa is above 7.8, the conditions of the water will be compromised with clouding and discoloration. The Leisure Time Spa Down granular chemical will dissolve at a fast rate, lowering the pH and alkalinity of the water to the proper level. It also works with every type of pool sanitizer, from chlorine to bromine and biguanide, and ensures that these sanitizers will treat the water effectively.

Considering the glowing customer reviews associated with this product, it is worth consideration as you shop.

Additional Products To Consider

If none of the above pool care products fit your requirements, don’t be concerned. There are several other options available on the market today. Here are five more reputable pH-lowering products to take a look at:

6. Kem-Tek KTK-50-0010 pH Minus Pool And Spa Chemicals

This Kem-Tek pool care product has been highly rated by many customers on Amazon. You will get 7 pounds of this pH decreaser. It consists mainly of sodium bisulfate, will dissolve quickly, and is safe for use in salt water pools.

7. Aqua Chem pH Down For Swimming Pools

The pH Down by Aqua Chem is made primarily from sodium bisulfate, and is sold in a 5-pound container for an affordable price. With an average of 4.4 stars on Amazon, this Aqua Chem product will effectively balance your pool water.

8. In The Swim Pool pH Reducer

In the Swim is known for discount pool supplies, and this bulk container of granular sodium bisulfate does not disappoint. This product provides 60 pounds of effective pH lowering chemicals. This great value will eliminate the need to re-purchase for years.

9. GLB 71242A pH Down Sanitizer

This exceptionally affordable pH reducer weighs in at 10 pounds. It works well with bromine, ozone, chlorine, and biguanide sanitizers, as well as in salt water swimming pools.

10. PacifiClear F084006048pc pH Minus Balancer

PacifiClear is a trusted brand of pool care products. This pH reducer consists of 93.2% sodium bisulfate. You will receive six pounds of safe, effective, and fast-dissolving product.

Buying Guide

Before you purchase and use a pH reducer for your pool, there are some important factors to keep in mind. Firstly, know the significance of the pH level in a pool. The acidic level of swimming pool water is described as the pH. The ideal range for water in a swimming pool is 7.2 to 7.8; at this level, the water will be clear, clean, and gentle on skin and eyes. When the pool pH gets too high, you will notice skin irritation and an off-color look to the water, such as clouding or haziness. Also, chlorine and other sanitizers don’t function as well in unbalanced water, and the water can scale. Scaled water elevates the pressure put on your pool system, increasing the chance of leaks, plugs, and damage to equipment.

The first step in the process of lowering a high pH level is to test the water. There is an abundance of swimming pool tests available on the market today. Once you know the exact, current pH level of your pool, you will know how much product is required. It is important to use the correct amount of product as recommended by the manufacturer to ensure precision and avoid chemical overdose.

All pH reducers are comprised of some type of chemical or acid. This means that you must take certain safety precautions during use and storage of this type of product. Before use, read over all packaging and instructions thoroughly to understand the specific requirements of that product. The dosage, process of water application, and storage conditions can all vary among different products. Choose a day with clear weather conditions to add the chemical to your pool. In windy conditions, granular chemicals can blow away from the water and onto unwanted surfaces. If you plan to use liquid acid, know that you will need protective clothing and eye gear, and well as protection for your surfaces.

If you are confused or unclear in any way about how to properly use your pH decreaser, consult a pool maintenance professional. There are many helpful online resources for additional information, and you can always refer to your local pool care provider.

Check out this awesome YouTube video to learn more about lowering the pH in pools:


Having a clean, comfortable pool for personal use is a coveted pleasure, making for countless entertaining opportunities, fantastic exercise options, and endless fun with family and friends. However, owning a swimming pool also requires attentive care and maintenance. All pool owners will have to manage the pH level of their water. When a test informs you of a high pH in your pool, it is time to find the best pH decreaser for you. If you are unsure of how to lower the pH in your pool, look to the above tips, information, and products; this guidance will simplify the tedious process of balancing the pH of your water. With a little help, you and your loved ones will be enjoying a clear, sparkling swimming pool.

Product images sourced from Amazon.com​

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Omni pH Decreaser, 8 lbs
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