Natural Chemistry 07404 Spa Swimming Pool Salt Water Magic Monthly Chemical Kit 4 New Natural Chemistry Salt Water Magic Monthly Kits Phosphate Remover: reduces phosphate levels. Low phosphate levels help prevent calcium phosphate buildup on the cell and pool equipment Natural Enzymes: reduce non living organic buildup in water, on pool surfaces, and in filter media. This minimizes maintenance and scrubbing resulting in soft feeling, crystal clear water Metal Chelator: powerful chelating/sequestering agents protect the pool surfaces from metal staining Scale Preventer: prevents damaging scale buildup from calcium and other minerals from forming on pool surfaces and generator/electrolytic cell