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What raises pool pH?

Author

Emma Payne

Published Jan 14, 2026

To raise your pool pH levels, try adding in sodium carbonate (AKA soda ash). Make sure that you don't add any more than two pounds of soda ash per 10,000 gallons of water per treatment. When adding in the soda ash, start adding from the deep end of your pool and work your way up to the shallow end.

What causes pH to rise in pool?

Algae can raise the pH. Adding strong liquid chlorine, calcium or lithium hypochlorite chlorine may raise it. Suddenly heating the water, whether from a pool heater or a string of sunny days, could up the pH.

What naturally raises pH in pool?

Baking soda, also known as sodium bicarbonate is naturally alkaline, with a pH of 8. When you add baking soda to your pool water, you will raise both the pH and the alkalinity, improving stability and clarity. Many commercial pool products for raising alkalinity utilize baking soda as their main active ingredient.

What products raise pH in pool?

And there are two different chemicals you can use to raise the pH in your pool:

  • Baking Soda aka sodium bicarbonate (sold as Alkalinity Increaser in pool stores).
  • Soda Ash aka sodium carbonate (sold as pH Increaser in pool stores).

Does chlorine increase pH?

Using liquid chlorine raises the pH of the water.

When added to water, liquid chlorine (which has a pH of 13) makes HOCl (hypochlorous acid – the killing form of chlorine) and NaOH (sodium hydroxide), which raises pH.

15 related questions found

Does Shocking a pool raise pH?

When you shock a pool, you test and adjust the pH level for a reason. With that said, if you shock a pool outside of the 7.2 to 7.4 pH range, not only will you waste a significant amount of the chlorine used, you will also end up with cloudy water.

Is it OK to swim in pool with high pH?

Can you swim in a pool with high pH? Definitely, but know that chlorine in the water may not be as effective as it normally would and you may be exposing yourself to harmful microorganisms. Besides, the water can also turn cloudy and your pool sides may scale due to alkaline water.

How do I raise the pH in my pool without raising alkalinity?

Use Aeration to Raise Pool pH

Looking to raise pH without affecting Total Alkalinity? You can sometimes raise the pH through aerating the pool water. Yep, just add air! It's the same reason hot tubs and spas often suffer from high pH issues.

Can you swim in a pool with low pH?

Low pH is bad for swimmers, your pool and your wallet. Acidic water is corrosive. The most immediate effect is felt by swimmers as the water will sting their eyes, nasal passages and will dry out skin and hair, causing itching.

How do I fix the pH in my pool?

Most pool experts recommend a pool pH between 7.2 and 7.8. To raise or lower pH, a pool custodian simply adds acids or alkalis into the water. For example, adding sodium carbonate (soda ash) or sodium bicarbonate (baking soda) will generally raise the pH, and adding muriatic acid or sodium bisulfate will lower the pH.

How do you fix high pH?

To bring down pH, use a made-for-pools chemical additive called pH reducer (or pH minus). The main active ingredients in pH reducers are either muriatic acid or sodium bisulfate (also called dry acid). Reducers are readily available at pool supply stores, home improvement centers and online.

Can you add too much baking soda to pool?

In the case where too much baking soda is added to hard water, it can cause a build-up of calcium around your pool. Too much calcium can cause cloudiness around a pool, while also building up scales on the surface of the pool.

Does rain make pH go up or down in pool?

Rainfall dilutes pool chemistry levels and lowers the readings for pH, alkalinity, hardness, stabilizer, and chlorine.

How do I lower my pH naturally?

Add vinegar to the water for an inexpensive fix.

The natural acidity of the vinegar will help neutralize the alkalinity in the water, bringing a pH of 7.5-7.7 down to about 5.8-6.0. Vinegar has a pH of 2-3 and lemon juice has a pH of 2, so their effect on water is similar.

Do you adjust pH or alkalinity first?

Check Total Alkalinity (TA) first, then adjust for proper pH range. Proper TA will buffer pH, that is, it will help to prevent pH fluctuations. Use fresh, high quality test strips. Excessively high bromine or chlorine levels can result in false pH and TA readings.

What happens if pH is too low in pool?

Low pH levels lead to a number of issues from maintenance headaches like premature erosion of grout and corroded fixtures like ladders and diving boards. Low pH causes pool liners to become brittle and crack. It also causes discomfort for swimmers like burning eyes and itchy skins.

Can you use vinegar to lower pH in pool?

Ordinary household vinegar could in theory be used to lower the pH of your pool. The pH of vinegar is about 2.5, which is quite acidic when compared to your pool water. Household vinegar is very weak though (when compared to a strong acid like muriatic acid), so you would need quite a bit to lower pH.

How can I raise my pH without raising hardness?

There is no thing you can add to the water to raise pH without raising alkalinity, that would be impossible chemistry-wise. The only thing you can do is try to remove the acid (CO2) that's building up. The best thing to do would be to ignore it.

Does raising total alkalinity raise pH?

From a water balance standpoint and from a practical standpoint, a high alkalinity will continuously raise the pH. You will always be adding acid to a pool that has high alkalinity.

Does baking soda raise pool alkalinity?

Baking Soda (Sodium Bicarbonate) is used to raise alkalinity and also slightly raise pH. And Soda Ash (Sodium Carbonate) is used to raise pH and slightly raise alkalinity. For example, getting a pH reading around 7.2 to 7.6 in 10,000 gallons (37,854 liters) of pool water would take roughly 21 pounds of baking soda.

Is 8.2 pH too high for pool?

The pH range of 7.2 to 7.8 should be considered an IDEAL range, not the minimum and maximum. Many pool service companies have been successfully maintaining the pH between 7.8 and 8.2 on tens of thousands of pools without reports of disease or algae outbreaks resulting from high pH.

Does muriatic acid lower pH?

When used correctly, muriatic acid can lower the pH levels of your pool water. The potency of muriatic acid makes it beneficial at getting rid of hardened water that has become too alkaline.

Will adding shock lower pH?

Pool shock.

Shocking your pool is important, but if you're using cal-hypo (calcium hypochlorite), it can raise your pool's pH levels. Don't stop shocking your pool, but do test all your chemistry levels consistently, especially after shocking.

How do I raise the pH and alkalinity in my pool?

The industry standard has always been to use sodium bicarbonate (baking soda) to raise total alkalinity and sodium carbonate (soda ash) to raise pH — the exception being if both total alkalinity and pH are low.

Will adding more chlorine lower pH?

High chlorine levels decrease the pH of your pool's water, making it more acidic. The more acidic the water, the higher the likelihood of corrosion. This corrosion can affect metal piping, equipment, and the surface of your pool (tiles, liners, concrete, etc.).