Before using CrystalClear pH Salts Up, test the pH of the water first with CrystalClear Test Strips. This should give a good indication of your pH level before you apply CrystalClear pH Salts Up. CrystalClear pH Salts Up will raise the pH of pond water to within safe levels. It is recommended to be used only when the pH of a pond is lower than 6.0. It is importan to note that pH is typically lowest at dawn and higher at dusk. Fish respiration lowers the pH and photosynthesis raises the pH. Thus, it is very important to test your pond pH at the same time each day. Adjust pH at 0.2 points per day. A drastic change in pH may cause stress or even death in ornamental fish. Treats 5,000 gallons CCPSU 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.