Eliminates yellow or mustard colored debris in pools and can be used to create a bromide base when starting up a brominated hot tub or spa (see directions). Yellow Eliminator is specially formulated to eliminate cloudy water due to accumulations of yellow or mustard-colored debris from pool surfaces. Stain remover ? Helps remove yellow stains from pool surfaces Works as a clarifier ? Helps clarify and clear cloudy pool water by removing the yellow debris and restores the sparkle to the pool No chlorine demand ? Can be used in pools treated with liquid or dry chlorine products Compatible with sanitizers ? Is compatible with most chlorine based sanitizers used to treat pools. Additionally, brominated hot tubs and spas require an adequate bromide base for adequate sanitation, Yellow Eliminator is an excellent choice to establish this residual.