How to Raise The pH in a Pool: Everything You Need to Know for 2026

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Learning how to raise the pH in a pool is a core skill that every pool owner must master. The water quality of the swimming pool is like a scale, sometimes you need to lower the pH to deal with scaling, and when the pH is below 7.2, you must take immediate action.

Mastering how to raise the pH in a pool not only allows swimmers to bid farewell to eye pain, but also is the best way to prevent expensive equipment from being corroded by acidic water.

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Why is the pH value of the swimming pool important?

The pH value is an indicator for measuring the acidity or alkalinity of pool water, with an ideal range of 7.2-7.6

  • Human comfort: The pH value of human tears is about 7.4. When the pH of the pool water is too low and acidic, swimmers will feel strong eye burning and skin itching.
  • Equipment protection: Acidic water is corrosive and can quietly dissolve the grout on the pool wall, causing pitting corrosion on the copper heat exchanger of the heater.
  • Disinfection cost: Although chlorine is highly active at low pH values, it is extremely unstable and quickly decomposes under sunlight, forcing you to invest more chemicals.

Why does the pH value of the swimming pool decrease?

In 2026, professional maintenance needs to look for the root cause from the source, rather than just blindly adding medication:

  • Acid rain and environment: Rainfall often becomes acidic, and after heavy rain, it can significantly lower the pH value of swimming pools.
  • Long term use of chlorine tablets: Many commonly used chlorine tablets are inherently strong acidic, and long-term use will gradually consume the alkalinity of water.
  • Total alkalinity TA deficiency: If your total alkalinity is below 80ppm, the pH value will lose its buffer, experience severe fluctuations, or continue to decrease.
  • Human metabolism: Sweat and bodily secretions are also contributing factors to water acidification.

What happens if my pool has low pH?

If you don’t pay attention to low pH values, you could end up with these expensive problems:

  • Damage to hardware includes rusting on the metal ladder, seals on the water pump that get harder, and a heater that works less well.
  • Damage to the pool body: Acidic water can pull calcium out of concrete and tiles, making the pool walls rough and more likely to sprout algae.
  • Swimsuit fading: Acidic surroundings can speed up the breakdown of fabric fibers, which makes swimsuits last less long.

How to measure the pH in a pool?

When is the best time of day to measure pH?

The best testing time is in the morning or evening, avoiding testing in strong sunlight.
Strong light can affect reagent reactions and may also cause measurement errors.

How often should pH be checked?

  • Private swimming pool: at least 2-3 times a week
  • Public swimming pool/commercial swimming pool: 1-2 times a day, or as required by local regulations

After high usage frequency or large dosage, the detection frequency should be increased.

Which testers work best to find out the pH in a pool?

Accuracy is money.

  • Use digital pH sensors: abandon traditional test strips that are difficult to distinguish colors. By using an industrial grade digital pH meter, accurate real-time readings can be obtained to two decimal places, eliminating misjudgments caused by lighting conditions.
  • Sampling standard: Sampling must be conducted in deep water areas and 45cm below the water surface. Before sampling, ensure that the water pump has been circulating for at least 30 minutes to ensure the representativeness of the sample.

How to raise the pH in a pool?

Option A: The fastest way to use Soda Ash/Sodium Carbonate

This is the preferred solution to increase the pH value without significantly changing the total alkalinity.

  • Reference measurement: To increase the pH of 10000 gallons of water from 7.0 to 7.4, typically 170-200g of sodium carbonate is required.
  • Operation: Dissolve in a bucket first, then slowly pour along the edge of the pool.

Option B: Baking Soda with consideration for total alkalinity

If your pH and total alkalinity are both low, please choose this method as it can provide longer-term stability.

Option C: Aeration, zero cost “black technology”

By turning on fountains, waterfalls, or adding air compressors to make the water fluctuate violently, carbon dioxide can be released. Due to the acidic nature of carbon dioxide in water, its loss naturally and gently increases the pH value without adding any chemicals.

Comparison: Soda Ash vs Baking Soda

ChemicalEffect on pHEffect on AlkalinityBest Used When
Soda Ash (Sodium Carbonate)Strong increaseModerate increasepH is too low and needs fast correction
Baking Soda (Sodium Bicarbonate)Mild increaseStrong increaseAlkalinity is low but pH is near ideal

The Automated Solution: Why Smart Pools Stay Balanced

Manual dosing is a “rollercoaster”—you add chemicals, the pH spikes, then it slowly drops again. Automation creates a “flat line” of perfect balance.

How It Works:

  • Continuous Sensing: An industrial-grade sensor (like the Sino-Inst pH Controller) sits in your circulation line, measuring water every second.
  • Smart Controller: The controller receives the data. If it detects the pH dropping below 7.4, it triggers the next step.
  • Precision Dosing: A chemical feed pump injects tiny, precise amounts of pH increaser (liquid soda ash) or CO₂ .

The Result: You save up to 30% on chemical costs by avoiding “over-dosing,” and you never have to worry about manual calculations again.

Why does increasing pH fail? (Common misconception)

If the value remains unchanged after adding medication, it is usually due to the following reasons:

Usually, if there is no change, there will still be these reasons:

why does increasing pH fail？

👉 Solution:
Always adopt the method of “small dosage, multiple adjustments” and ensure the continuous operation of the water pump.

Safety Tips

When increasing the pH and alkalinity of the swimming pool, please pay attention to safety:

  • Wear personal protective equipment (PPE)
    Rubber gloves, protective goggles, non slip shoes, long sleeved clothing
  • Follow the principles of chemical use
    👉 Always add chemicals to water, not pour water into chemicals
  • Avoid adding large quantities at once
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FAQ

The best pH range for pool water is between 7.2 and 7.8, with 7.4 and 7.6 being the sweet spot. This range is very close to the pH of human tears and skin, so it keeps discomfort to a minimum while still killing germs very effectively. If the water is too acidic (pH < 7.0), it can rust the pool equipment. If the water is too alkaline (pH > 7.8), it can scale and make the water cloudy.

Acidic rain, a lot of swimmers (sweat and bodily fluids), and chlorine pills (which lower pH) are all common culprits. A low TA (less than 80 ppm) also makes it harder for water to keep its pH stable, which causes it to drop often. To make it better: First, check the TA. If it’s low, add baking soda to get it up to 80–120 ppm. If chlorine pills are the problem, switch to pH-neutral disinfectants and use soda ash to bring the pH down to 7.2–7.8.

A high pH can cut chlorine’s ability to kill germs by as much as 50%, which makes it more likely that bacteria and algae will thrive. It also makes minerals build up on pool walls, filters, and pipes, and it makes skin dry, eyes sore, and water hazy. Use tiny amounts of pool-specific pH reducers, like sodium bisulfate, to fix it. Wait 24 hours between applications to avoid big decreases.

Yes—total alkalinity (TA) acts as a “buffer” for pH . If TA is below 80 ppm, pH will be unstable and keep dropping even after adjustments . If TA is above 150 ppm, pH will be hard to lower and may creep upward . Aim for TA of 80–120 ppm first (use baking soda to raise it, partial change the water to lower it), then adjust the pH of pool water with soda ash or a pH reducer .

Which choice is ideal for you depends on the total alkalinity (TA) in your pool: If the pH is low (less than 7.0) but the total aqueous concentration (TA) is normal (80–120 ppm), you should use soda ash, which is also called sodium carbonate. It quickly elevates the pH level without making the water too alkaline when you use about 0.5 pounds per 10,000 gallons.

When both the pH and the TA are low, use baking soda (also known as sodium bicarbonate). It has a mild composition that raises pH and increases buffer capacity (TA) over time. You need about 1.5 pounds of it for every 10,000 gallons of water. It is very important to dissolve one of the chemicals early to stop clumping or temporary cloudiness.

Use soda ash as your main solution. It directly affects pH with little effect on TA, unlike baking soda. To avoid going too far, add it in small amounts (0.25 pounds per 10,000 liters) and test again after 6 hours. If TA is already high (above 150 ppm), first partially empty the pool and fill it back up with fresh water to lower TA. Then add soda ash to change the pH. Don’t use calcium-based products at the same time as other drugs, as this can induce scaling.

Check the pH level once to four times a week when things are normal. Raise the number of times to once or twice a day during peak swimming season, after heavy rain, or after adding chlorine. This method is more accurate than using strips. Take samples of water 30 to 40 cm below the surface, away from skimmers and return jets. Small changes in pH don’t become big problems when they are tested regularly.

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Conclusion: Automate, not chase numbers
It doesn’t take frequent testing and hand dosing to maintain the ideal pH balance. Soda Ash and Baking Soda are critical maintenance tools, but the best pool operators reduce physical work.

An Automated pH Controller protects your pool investment, improves swimmer comfort, and reduces chemical waste. Sino-Inst specializes in precision. Our industrial-grade sensors provide accurate monitoring for high-traffic commercial water parks and luxury private pools.

Ready to simplify pool upkeep? Contact us for your customized plan.

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