This year PONDCARE® introduces QUICK START™, an innovative new treatment to the simplify Spring start up. QUICK START contains live, nitrifying bacteria to immediately start the biological filter and support a healthy, balanced pond all season long. The unique, patented nitrifying bacteria in QUICK START are scientifically proven to quickly consume ammonia and nitrite. Use when starting a new pond, adding new fish, changing water, changing filter media, after medicating , or whenever ammonia or nitrite are detected.. Allows instant addition of koi and pond fish. Limits toxic ammonia and nitrite. Contains live, nitrifying bacteria. No refrigeration require. All natural.