pH Decreaser will slowly lower the pH level of your swimming pool if it gets too high. Keeping your pool's pH level balanced is not only important for swimming comfort, it also helps keep your equipment and pool finish in good condition. In addition, many swimming pool algaecides require the pH to be balanced in order to work properly. A great feature of pH Decreaser is that is a granular chemical. This means it is safer to handle and use than liquid acids such as muriatic (hydrochloric) or sulfuric acids. Product Dosage: pH 7.8 to 8.0 3/4 lb per 10,000 gallons of water pH 8.1 to 8.4 1 1/4 lb per 10,000 gallons of water pH above 8.4 1 1/2 lb per 10,000 gallons of water Directions: Balance total alkalinity in pool water to 80-125 ppm for plaster finishes and 125-150 for vinyl, fiberglass and other non-masonry finishes For most efficient performances of pool chlorine, pH should be maintained between 7.2-7.6. Use a reliable test kit to determine pH. If the test shows a pH above 7.6 add this product to your swimming pool per the dosage listing below. Treatment: To add pH Decreaser, broadcast into deep end of the swimming pool when not in use. Add directly to the pool water with pump and filter running. Never add more than 1.5lb of this product per 10,000 gallons of water at any one time. Allow pool water to recirculate 2 hours and retest pH. Repeat treatment as necessary. Do not add near metal fittings or allow pH to drop below 7.2. Do not allow undissolved lumps to remain on the swimming pool bottom. The undissolved pH Decreaser can be broken up by brushing or other means of agitation.