All-natural Made from evaporated sea water. Reduces fish stress and provides essential electrolytes. Improves gill function and protects fish against nitrite toxicity. Can be used with medications to improve recovery from disease. Pond salt does not evaporate and only needs to be reapplied when a water change occurs. Treats up to 6250 gallons for ponds with plants Treats up to 3125 gallons for ponds without plants. PondSalt50lb Most Orders Shipped Out Same Day! Premier Ponds LLC pondinfo@premierponds.com U.S.A. Copyright © 1999 - 2007 Premier Ponds LLC, North Salem, New York. All rights reserved. Thermo-Pond Heater 3.0, Aquascape Designs Pond Kits, ScareCrow Sprinkler, Nursery Pro Micro Pond Kits, AquaClearer, Microbe-Lift, Great Blue Heron Decoy, Pond Liners, Thermo Pond Heater & Deicer, Premium Koi Food, Select Koi, Butterfly Koi, Pond Aeration Pumps, Flexible PVC Piping, BioFalls, Skimmer, Aquascape Pumps, Cat Stop!, Animal Control Products, Pond Netting.