Maintaining proper water chemistry is crucial for a safe, comfortable, and enjoyable swimming experience in your backyard pool. While many pool owners focus on pH and chlorine levels, another essential factor in water balance is total alkalinity. An alkalinity increaser for pools is vital for raising and stabilizing alkalinity levels, ensuring your pool water remains within the ideal range.

In this comprehensive guide, we’ll explore what alkalinity increaser is, why it’s important, and introduce you to the top brands available on the market.

Understanding Alkalinity Increaser for Pools

What is an Alkalinity Increaser?

Alkalinity increaser, or alkalinity up or booster, is a pool chemical used to raise the total alkalinity level in swimming pool water. Total alkalinity refers to the water’s ability to resist changes in pH, acting as a buffer to prevent sudden fluctuations. The ideal total alkalinity range for pool water is between 80 and 120 parts per million (ppm), with 100 ppm being optimal.

Alkalinity increaser typically contains sodium bicarbonate (baking soda) as the active ingredient, raising alkalinity without significantly impacting pH levels.

Why is Alkalinity Important in Pool Water?

Maintaining proper alkalinity levels in your pool water is essential for several reasons:

  1. pH Stability: Alkalinity acts as a buffer, preventing sudden changes in pH levels caused by external factors like rainwater, swimmer waste, or pool chemicals. When alkalinity is within the ideal range, pH levels are more stable and easier to control.
  2. Equipment Protection: Low alkalinity can lead to corrosive water, which can damage pool surfaces, equipment, and plumbing over time. By keeping alkalinity levels balanced, you protect your investment and extend the life of your pool components.
  3. Swimmer Comfort: Water with low alkalinity can cause skin and eye irritation and an unpleasant swimming experience. Proper alkalinity levels ensure the water is comfortable and safe for all swimmers.
  4. Chlorine Efficiency: Alkalinity plays a crucial role in the effectiveness of chlorine, your pool’s primary sanitizer. When alkalinity is too low, chlorine becomes overly active and dissipates quickly, reducing its ability to keep the water clean and safe.

How to Use Alkalinity Increaser

Using alkalinity increaser is a straightforward process, but it’s essential to follow the proper steps and safety precautions. Here’s a step-by-step guide:

  1. Test your pool water alkalinity using a reliable test kit or test strips.
  2. If the alkalinity level is below 80 ppm, calculate the amount of alkalinity increaser needed based on your pool’s volume and the product’s instructions.
  3. Turn on your pool pump to ensure proper circulation.
  4. Broadcast the alkalinity increase evenly across the pool’s surface, avoiding areas with poor circulation or dead spots.
  5. Allow the pool pump to run for at least 2-4 hours to distribute the alkalinity increaser thoroughly.
  6. Retest the water after 24 hours and repeat the process if necessary until the alkalinity level is within the ideal range.

Remember to always wear protective gloves and eyewear when handling pool chemicals and store them in a cool, dry place out of the reach of children and pets.

Top Alkalinity Increaser Brands for Pools

Top Alkalinity Increaser Brands for Pools

When shopping for alkalinity increaser, you’ll find numerous brands and products on the market. Some of the top alkalinity increaser brands for pools include:

  1. Arm & Hammer Baking Soda: A versatile and affordable option, baking soda is an effective alkalinity increaser that’s gentle on pool surfaces and equipment.
  2. Clorox Pool&Spa Alkalinity Up: This granular alkalinity increaser is fast-acting and easy to use, making it a popular choice among pool owners.
  3. In The Swim Alkalinity Increaser: Formulated with premium sodium bicarbonate, this alkalinity booster is highly effective and dissolves quickly for fast results.
  4. Leslie’s Pool Alkalinity Up: Made with high-quality ingredients, Leslie’s Pool Alkalinity Up is a reliable choice for raising pool water alkalinity and maintaining proper water balance.
  5. Rx Clear Alkalinity Up: This concentrated alkalinity increaser is easy to measure and pour, and it’s compatible with all pool types, including saltwater pools.

When selecting an alkalinity increaser product, consider factors such as the size of your pool, the severity of the alkalinity imbalance, and the product’s ease of use and compatibility with your pool type.

Frequently Asked Questions

  1. What happens if my pool water alkalinity is too low? When pool water alkalinity is too low (below 80 ppm), the water becomes acidic and can cause several issues, such as:
    • Corrosion of pool surfaces, equipment, and plumbing
    • Etching of concrete and tile surfaces
    • Skin and eye irritation for swimmers
    • Rapid chlorine dissipation and reduced sanitizing effectiveness
    • Fluctuating pH levels that are difficult to control
  2. Can I use alkalinity increaser and pH increaser interchangeably? While alkalinity increaser and pH increaser both contain similar ingredients (like sodium bicarbonate or soda ash), they are not interchangeable. An alkalinity increaser is specifically designed to raise total alkalinity without significantly affecting pH, while a pH increaser is used to raise pH levels directly. Using the wrong product can lead to imbalances in your pool water chemistry.
  3. How often should I test my pool water alkalinity? Testing your pool water alkalinity at least once a week or more frequently during heavy pool usage or adverse weather conditions is recommended. Regular testing helps you identify and address alkalinity imbalances promptly, preventing potential issues and maintaining proper water balance.
  4. Can I use household baking soda to raise my pool water alkalinity? Yes, you can use household baking soda (sodium bicarbonate) to raise your pool water alkalinity. However, it’s essential to use pure baking soda without any additives or fragrances, as these can affect water quality and clarity. Also, remember that baking soda can also slightly raise pH levels, so be sure to monitor both alkalinity and pH when using this method.
  5. What is the ideal range for pool water alkalinity? The ideal range for pool water alkalinity is between 80 and 120 parts per million (ppm), with 100 ppm being the optimal level. This range provides a stable buffer to prevent pH fluctuations, protects pool equipment and surfaces, and ensures swimmer comfort and chlorine effectiveness. Regularly testing and adjusting alkalinity levels with an alkalinity increaser is crucial for maintaining proper water balance.


An alkalinity increaser is a crucial tool for maintaining proper water balance in your swimming pool. By understanding what alkalinity increaser is, why it’s important, and how to use it effectively, you can ensure your pool water remains safe, comfortable, and crystal clear for all swimmers.

Remember to test your pool water regularly, choose a high-quality alkalinity increaser product, and follow proper safety precautions when handling pool chemicals. With the right knowledge and tools, you can confidently manage your pool water chemistry and enjoy a perfectly balanced pool all season long.