Tetra Aquasafe Dechlorinator keeps fish safe every time you add water! Prevents fish gills from burning as well! Simply add 2 teaspoons for every 50 gallons of tap water or well water you are adding to your pond or water feature. One 8.45 oz bottle treats about 1200 gallons of water. Tetra Aquasafe Instant Dechlorinator is safe for plants and fish when used as directed.