Spa Plus is an oxidizing Shock, Buffer, Clarifier, Stain & Scale Preventative. This superior product not only shocks, but effectively oxidizes organic material in your hot tub that causes cloudy water, offensive odors and eye irritation. These oxidizing properties combined with water clarifiers and buffers. produce sparkling clear water with no cloudy residue and no effect on pH like regular shock products. This product is not a disinfectant, sanitizer or algaecide.