CrystalClear, 16 OZ, AmmoniaFix, Contains Billions Of Ammonia, Nitrite & Nitrate Removing Bacteria, The Bacteria Inside Are Designed By Nature To Utilize These Substances As A Food Source & Remove Them From Pond Water, Use To Seed Filters, Clear Water & Reduce Harmful Ammonia & Nitrite Levels In A Pond Environment, The Result Is Safer, Cleaner Water For Fish & Plants, Safe For All Aquatic & Domestic Animals, 16 OZ Treats 4,000 Gallons.