If calcium hardness is higher than 1,000 PPM, partially drain and replace some water. Check with Your dealer for directions. Water in a newly filled pool turns blue, brown, or black when first treated chemically. Causes Dissolved metals in the fill water that become visible after being oxidized by chlorine. Water velocity in circulatory system is too high and erodes metal.
Remedies Balance the pool water by adjusting pH, total alkalinity and calcium hardness as necessary.
Readjust pH to 7.2-7.8, if necessary. To avoid this problem in the future, use SUN Metal Control. Water in an already filled pool turns various colors. Causes Metals in fill water. Leaves or other organic debris in water Remedies Adjust pH to 7.2-7.4, if necessary.