Cold Water Beneficial Bacteria keeps your pond clear and your ecosystem balanced when the water is below 50 degrees. This formula includes seven strains of concentrated bacteria that eat the excess nitrites in your pond, keeping green-water-causing algae at bay when the temperature is too cold for regular Beneficial Bacteria products.
Treat once weekly for maintenance to keep water clear, or two to three times a week to treat water that is already green. Switch to regular Beneficial Bacteria when water temperatures are above 50 degrees. Beneficial Bacteria is completely safe for fish, plants and pets.