Swimming Pool Stores carries a large supply of products to maintain the pH balance and water quality of your swimming pool, hot tub, or spa. pH is a measure of the acidity of the water. The optimum pH for pool water is 7.4, since this is the same as the pH in human eyes and mucous membranes. Low pH levels can damage the mechanical components of your pool, damage the liner, and irritate the eyes of swimmers. A high pH level can cloud the water, irritate the skin, create lime buildup and fail to adequately disinfect your water properly. Don't leave the safety and health of your swimmers or your pool at risk, order one of these products today!