RFW1009: Features: -PH increaser. -Slows the rapid loss of chlorine caused by low pH and slows chlorine dissipation, so your pool uses less chlorine. -Stops eye irritation, etching and corrosion caused by low pH. -Contains sodium carbonate 'soda ash'. -Recommended dosage: 1 lb per 10,000 gallons. -Ideal pH range is 7.2 to 7.6 ppm. -Dimensions: 9 H x 8.5 W x 9 D.