11 ways to reduce the pH of water

Both too low and too high water pH levels have corresponding adverse effects. Therefore, it is important to know how to reduce the pH of water to bring it back to balance; Good for consumption, swimming pools, and fish ponds. Consider the following methods.

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How to reduce the pH of water.


Alum is the method of reducing water pH most used by the community, both lowering the pH of swimming pool water and fish ponds as well as lowering the pH of river water and drilled well water.

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Use alum to reduce the pH of water.

Alum (Al2(SO4)3) can aid sedimentation and can lower the pH of the water. For example, water with a neutral pH of 7 can be quickly reduced to a pH of 6.5 when alum is used. The sedimentation process will also cause the water’s pH to further decrease to pH 5. Surprisingly, alum can also purify water through flocculation. Therefore, this type of alum can be used as a tool with two different functions that are mutually beneficial.


The lower the pH of the water, the more acidic the water content is. Therefore, it is not surprising that lemon, known for its acidity, can also be used as a way to reduce the pH of water, especially drinking water.

This vitamin C-rich fruit, in addition to quenching thirst, can actually be used to balance and even lower the pH of the water we consume. However, just make sure that the acidity level in the water is at a reasonable level, as a water pH that is too low will taste very sour and bitter. You can also add lemon slices to your water, also known as the detox water trend.


Another natural way to reduce the pH of water is to use papaya stems and leaves. This method is supported by pangasius farmers because it does not use chemicals and is safe for the health of pangasius raised in ponds. In fact, papaya stems and leaves can also be food for catfish. You just need to soak the papaya leaves and stem sections in a puddle of water

Ketapang leaves

One of the most natural ways to reduce the pH of water is to use ketapang leaves. Ketapang leaves are a method used since ancient times to balance and reduce the pH of water.

For this method, you first need to boil ketapang leaves. Without this boiling process, the ketapang leaves will actually turn the water yellow due to the tannins in the ketapang leaves. After boiling, ketapang leaves can be taken and soaked in a puddle of water for several days. This natural way to reduce the pH of water is highly recommended as it does not pollute the surrounding environment and is known to be effective!

Hydrochloric Acid and Muriatic Acid

Hydrochloric acid and muriatic acid are commonly used as a way to reduce the pH of swimming pool water. In addition, hydrochloric acid and muriatic acid are also used to neutralize and control the pH of water in the pharmaceutical industry and bottled mineral water. It is very important to know how much hydrochloric acid to use.

Currently, there are many stores selling hydrochloric acid and muriatic acid solutions for swimming pools, but some are in concentrated form and must be diluted first. After pouring the hydrochloric acid and muriatic acid solutions, wait 4 hours before using the pool. Then, measure the pH again with a water pH meter.

Sodium bisulfate

This content, also known as dry acid, is often used to lower the pH of swimming pool water. Typically, sodium bisulfate is sold in powder form. Its usage is the same as hydrochloric acid.

You must be careful when using sodium bisulfate because prolonged skin contact with sodium bisulfate can cause irritation and even burns. Wait up to 4 hours after using sodium bisulfate. If the water’s pH is still high enough, you can add sodium bisulfate back into the water.

Install CO2 system

CO2 is fully automatic, which means the system will monitor the pH level in your pool and will add CO2 to lower the pH when necessary. Others are controlled manually, so you will need to check levels daily and adjust CO2 flow as needed. Remove crushed corals from the tank.

If you are having trouble with high pH in your tank, the substrate may be the cause. While it looks great in the tank, crushed coral can actually increase the pH of the water, so you should only use it if you keep fish that prefer a more alkaline environment.

Place driftwood in your aquarium for natural filtration and decoration

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Place driftwood in the fish tank to reduce the pH in the water.

In addition to looking great in fish tanks, driftwood also naturally filters the water in your tank. Even a small sample of natural driftwood will lower the pH in the tank and will also help stabilize it. Additionally, driftwood will give your fish a new place to explore.

Add peat moss to the filter

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Add peat moss to the filter to reduce the pH in the water.Because peat moss can clump together and can be removed when you clean the tank, it’s best to place the peat moss in a mesh bag, then place the bag in the filter. Peat moss will naturally support the filter, helping to reduce the pH level in the tank.

Install a water filter

Reverse osmosis filters are extremely effective filters that remove up to 99% of contaminants from water while leaving behind ions that help keep fish healthy. Since contaminants increase the pH of water, the filter will naturally lower the pH as it purifies the water [15].

Install acid filling system

An acid filling system automatically balances the water by determining the pH level. It then injects acid with a chemical metering pump into the water stream so that the water is lowered to neutral pH before flowing out of the faucet. Installation for this type of system is best handled by a professional, so talk to a local water professional in your area if you’re interested.

There are several ways to lower the pH of water, both using natural ingredients and chemicals. Another important thing you need to do is regularly measure the pH of your water with an accurate water pH meter.

See more: Pure salt tablets: Everything you need to know

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Translator: Duong Nguyen Hoang Khang

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