PoolRx+ is the #1 choice of Pool Pros and the only Algaecide with 3 active ingredients (Copper, Silver, Zinc). PoolRx+ kills and prevents all types of algae (including microalgae). This reduces chlorine and other chemical demand significantly and also reduces the amount of brushing, maintenance and call backs, saving Poo Pros time and money at every pool and spa. PoolRx is EPA Registered and NSF50 certified making it the perfect choice for both residential and commercial pools and spas.