Here is How To Lower pH In Pool ?

Ensuring your swimming pool water pH is reasonable is a critical part of pool maintenance. PH determines water acidity in your pool. PH numbers vary from zero to fourteen, with the best pool water pH levels being around seven point two and seven point eight.If the pH is high above 7.0, the water is more alkaline.

how to lower ph in pool

How to lower the pH of your swimming pool?

First, test the pH level of the swimming pool. Once you get the current pH, then you can quickly determine what you require lowering that value.

There are two primary chemicals that one can use to lower the pH level in the pool, and they are Muriatic acid and Sodium Bisulfate, also known as dry acid. Understand the chemical you buy because it matters. Use either of the two always for a good result.

Lowering ph level in your pool using Sodium Bisulfate:

On the container, there are some instructions. Read them carefully as different manufacturers put different percentages of dry acid. The common content percentage contained in the containers is 93.2%.
Based on your test results, determine how much acid you have to put. It is recommendable to add three-quarter of what is required and then retest as you add little by little to avoid adding too much acid till you have the best pH level

Because sodium Bisulfate comes in a powder form, avoid adding it when the weather is windy. It will help to avoid getting the Sodium Bisulfate on your skin or clothes.
Get as close to the water as possible to avoid the blowing of the dry acid into the air by the wind. By doing this, you will ensure that all the powder gets into your pool.

Add dry acid powder into the water at water return jet sights. It is at this point that the water flows into the pool. Because you want to spread the dry acid powder all around the pool, avoid adding the powder at the water inlet sights e.g skimmer area.

The sodium Bisulfate powder will dissolve within five to ten minutes and therefore there is no need to dissolve the water by hand.
Wait for a minimum of six hours for the powder to mix well before retesting. Also, remember not to wait beyond twenty-four hours after adding the last dose of the dry acid powder.

Important points on adding sodium Bisulfate:

Sodium Bisulfate will lower your alkalinity as well as the pH, therefore, remember to test both again.
For pools above ground, dump the dry acid along the wall of the pool. When the ground pools are shallower, you may be required to spread the dry acid in the pool to make the powder dissolve quickly.
If the manufacturers’ recommendation is you dilute the dry acid, then follow their instruction because their product may react fast in your water reducing alkalinity with no effect on the pH.
This way you can balance both the pH and alkalinity.

Also to lower the pH in pools, you can use Muriatic acid. Handle it with care to avoid spillage.
Read instructions given first. If not used correctly it can damage pool surface and burn your skin.
From the pH level, you tested, determine how much is required. Add three-quarter of what you need to add first, then check the pH later until and add until you get your desired results. If the instruction requires you to dilute the acid with water .follow the instruction.

Avoid dumping this acid in the water while facing the wind and do not add it to any inlet such as filter basket and the skimmer.

We have two ways by which we add the Muriatic acid, and both have applicable points:

  • Funnel the acid to the bottom. I suggest that you turn the pool pump off and allow the pool water to become still for an hour to minimize a decrease in alkalinity. Then pour the acid carefully without splashing it. Pour it in a continuous stream into one spot on the water. The acid will flow to the bottom and gently lower the pH of the water at the bottom without affecting the water above.
  • Spread it around. Position yourself near the water jets. To avoid getting the acid on any of the surfaces of the pool, pour the acid deep into the end of the pool. If there is no deep end, then pour slowly in an arcing line in one area and move to another area until you finish. Remember to avoid it being blown by the wind and away from return lines or water inlets. The acid will dissolve all round. Wait for a minimum of six hours for the pool to adjust to the Muriatic acid and retest. Add the acid little by little as you test to avoid putting too much acid. Do it before the end of twenty-four hours

Important points on adding Muriatic acid:

The acid is caustic. It will burn when it gets on your skin. Make sure you are well covered and don not forget to wear goggles to protect your eyes. Have clean water near you to wash anything immediately the acid spills on it.

When using Muriatic acid over concrete, use water to pre-wet the concrete to help with diluting any spill that may occur.

Observe the following when lowering pH in the pool

Avoid pouring any chemical into your skimmer filter basket because the water goes to the pool pump, heater, filter and other equipment.
When pH is very low, test strips and test kits cannot test anything higher than a pH of 8.6. In this case, you need to add a considerable amount of the acid to bring the pH value down to testable levels. You can adjust how much you need to reduce the pH ones you can test it.

Remember to follow instructions given on your product if they state otherwise.


When dealing with your pool, you will become familiar with the pool pH. And since balancing your pool pH is a thing that you must do, then lowering your pools water pH is a significant skill to learn. Pool pH needs testing regularly and high pH corrected as soon as possible to avoid cloudy and scaling water. Something you may find interesting is also heating your pool with air conditioning. Guys at GMTair are specialists at air conditioning so it’s best to ask them how to approach this.