ProTeam pH Down lowers pH and alkalinity in pool water. This product prevents scaling and is safer to use than liquid acid. Sanitizers work most efficiently when pH is kept in proper range. Therefore a properly balanced pool will require less sanitizer and less maintenance. Keeping your pool balanced is an important step in getting the most out of and preserving the life of pool and spa equipment. Best of all, pH Down is made right here in the USA to ensure the best possible quality, allowing you to buy with confidence.