Quick Definition:

Hydrochloric acid is commonly called muriatic acid, and is used to lower the pH level in swimming pools.

What is Hydrochloric Acid for swimming pools?

Hydrochloric acid is also called hydrogen chloride, and is also called muriatic acid.  It is a liquid solution, clear, and colorless in appearance.  Because of its strong acid content, hydrochloric acid is highly corrosive in strong concentrations.  Since hydrochloric acid is caustic, the fumes of this substance may cause a strong irritation of eyes, as well as a reaction of the respiratory tract.

Adding chlorine products to swimming pool water results in hypochlorous acid (HOCl) and hydrochloric acid (HCl) to be released into the pool water.  The chlorine present in the acid helps to sanitize chlorinated swimming pools.

For swimming pool water treatment, hydrochloric acid can be used in regulating the acidity in the water, neutralizing high pH levels in the pool water.  Instructions for use should be followed carefully, as adding too much will cause the water to become acidic and corrosion can occur.

Avoid spilling hydrochloric acid on concrete, metal, stone, grout, or any masonry surfaces, as the acid will immediately corrode these surfaces.  Wear eye protection, thick rubber gloves, and heavy clothing to protect the body while adding hydrochloric acid to swimming pool water.  Always pour the acid into the pool, never into the skimmer basket area or other swimming pool water outlet.

Always add the acid to the pool water, and never add water to the acid.

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