How to Reduce PH in Water

Tap water pH levels generally range between 6.0 and 7.8.
••• Jupiterimages/ Images

Maintaining a proper pH in water is very important, especially in fish tanks. If the pH gets too high, it can kill the fish. There are several remedies, including CO2, muriatic acid and phosphoric acid buffer. Knowing the benefits and side effects of the different methods can help determine the best way to treat your water.

How to Reduce pH in Water

    Bubble carbon dioxide through the tank. The carbon dioxide will break up and form carbonic acid which will help lower the pH. However, the pH will increase once the carbon dioxide ceases, making this an expensive solution.

    Use phosphoric acid buffer. This will bring the pH down to around 6.5, but will increase the phosphate levels. This is problematic because algae thrive in tanks with high phosphate levels.

    Add muriatic acid, also known as hydrochloric acid. While this can be a very effective method, it also has the potential to lower the pH drastically; follow the instructions carefully.

    Use a tap water filter. These filters remove minerals like sodium, fluoride and potassium by using small resin pellets to absorb the impurities and restore the proper pH level to the water. Tap filter systems can purify about ten gallons an hour.

    Things You'll Need

    • Carbon dioxide in gas form
    • Muriatic acid
    • Phosphoric acid buffer


    • Acid can very dangerous, so use caution when handling it.

Related Articles

Different Ways to Raise the pH of Drinking Water
How to Build Your Own Sump Tank for an Aquarium
How to Raise the Alkalinity in a Freshwater Aquarium
How Can pH Affect Your Fish?
Facts About Pacu Fish
What Is the Effect of PH on Living Organisms?
How to Maintain Alkalinity in Wastewater
How to Remove Chlorine From Water
How to Prevent Algae in Rain Barrels
How to Make Sea Water Into Drinking Water
How to Dissolve EDTA in Water
What Chemicals Are Used to Purify Drinking Water?
How to Calculate Water Levels in a Tank
What Is Lime Used for in Water Treatment?
How to Calculate Liters
What Variables Affect pH Levels?
How to Make Fenton's Reagent
How Can the Use of Fertilizers Result in Reduced O2...
How to Use Powdered Alum to Purify Water

Dont Go!

We Have More Great Sciencing Articles!