Laguna Water Prep is specifically formulated to provide many benefits to the entire pond environment. It makes tap or well water safe for fish and plants, it instantly eliminates chlorine and chloramine, and it coats and protects fish fins and scales. One 16 fl oz/473 mL bottle treats 2,500 U.S. gal. (9,460 L / 2,081 Imp. gal.) of pond water.