eeziblue Monthly Algaecide is a monthly pool additive that uses a proprietary Zn-Cu Synergy® formula, combining copper and zinc to effectively eliminate and prevent algae growth. Use it as a monthly treatment or a quick fix for green pools. Designed for chlorine or saltwater pools, it works as an algaecide, bactericide, phosphate remover and water clarifier, and can help reduce chlorine usage by up to 75%. eeziblue also makes pool water more resilient to extreme weather changes and helps reduce the number of mid-cycle maintenance visits - the perfect pool multitool.