A super-concentrated, pH buffered, sodium thiosulfate based solution designed to remove large amounts of chlorine and chloramine-fast! The resulting sodium (Na+) and chloride (Cl-) ions are essential for proper osmoregulation in fish. You only need one drop per gallon to remove chlorine. It also detoxifies chloramine, which is formed by bonding ammonia to chlorinated water. Chloramine is very toxic to aquatic life. In areas with chloramine, two drops per gallon will break the chlorine-ammonia bond and neutralize the freed chlorine. Quick and Easy Reference Instantly removes chlorine and chloramine in freshwater, saltwater, reefs and ponds Super Concentrated & Economical! One capful treats 100 gallons for chlorine; each capful treats 50 gallons of water when chloramine is present Very inexpensive: perfect for large aquariums, holding tanks and central systems Won't decrease pH in saltwater like competitive products; 100% phosphate free Information provided by Fritz