Pool Products All Pool ProductsAlgaecidesBalancersDisinfectantsEnhancersShocksTrouble ShootersWinter Filter: All Pool Products All Items Algaecides Balancers Disinfectants Enhancers Shocks Trouble Shooters Winter Alkalinity Up Raises total alkalinity in pool water. See More pH Up Increases pH in pool water. Proper pH makes… See More pH Down Decreases pH and alkalinity in pool water. Proper… See More Calcium Up Increases calcium hardness levels in pool water. Proper… See More