EasyCare Mcgrayel Pooltec 30064 Summer Pool Water Treatment 64oz The most effective pool treatment ever to boost chlorination in all types of swimming pools. Significantly reduces chlorine use, shocking, harsh chloramines, odors and cyanuric acid buildup. Ensures sustained treatment of pool water even when chlorine levels are low and pH is high. Pooltec synergy effect creates the most enjoyable and healthier swimming environment. Pooltec's unique chlorine synergy eliminates multiple algaecides, clarifiers, enhancers, and phosphate reducers.