Clorox Pool&Spa 23006CLXCA Xtra Blue Chlorinating Granules 6-Pound All purpose sanitizer, shock and algaecide Kills bacteria, reduces eye irritation and chlorine odor Removes organic contaminants for clear water Protected against sunlight to last longer. Compatible with salt pools and compatible with chlorine pools Add through skimmer or directly to water. Gallons of water treated per pound is 53000