How Much Copper Sulfate Can You Add to a Pool?

Copper Sulfate

• Adding copper sulfate to your pool water is not a suitable practice for regular pool maintenance although it can help treat an occasional overgrowth of algae. The American Journal of Public Health recommends using this treatment only when your pool experiences excessive algae growth. Copper sulfate helps reduce the amount of chlorine your pool requires, as well as improve the clarity of the water. Copper sulfate, by itself, won’t eliminate the need for chlorine or bromine although some products that contain copper sulfate also contain sanitizing ingredients that help control microorganisms.

Alkalinity

• A water test is necessary to determine the amount of copper sulfate your pool requires. Most swimming pool and spa suppliers offer a variety of swimming pool water test kits. Do not use copper sulfate treatments in water that has a total alkalinity reading below 20 milligrams per liter. A neutral pH level between 7 and 7.2 provides the optimal level of alkalinity for swimming pools.

Amount Required

• The ideal level of copper in your swimming pool water is between 1 and 1.2 parts per million. Consult your water test’s copper reading to determine the existing amount of copper in your swimming pool. Since copper sulfate comes in a variety of concentrations, especially in products that include other chemicals, it is important to read the label instructions before adding this substance to your pool water.

Treatment Method

• Copper sulfate products often require pre-mixing to avoid staining the edges or bottom of the swimming pool. This substance has a deep blue color that can create spots on the pool surface. Adding the concentrated product to a bucket of water allows you to dilute the color and the strength of the copper sulfate before it enters your swimming pool.