Airmax Stock Tank Defense contains all natural beneficial bacteria specially formulated for stock tanks. This all natural product will keep a stocktank clean and clear. Easy-to-apply no-mess Stock Tank Defense tablets are completely safe for horses, livestock, chickens, chicks, birds, fish & wildlife. When used as directed will not cause harm to any animal, cow, horse, donkey, pig, goat, llama, whitetail deer, chicken, duck, pet, or other wildlife. Ideal for stock tanks or any outdoor water container including a rain barrel, galvanized tub, Rubbermaid tub, small resevoir, or round watertank. A favorite at farms, ranches, animal sanctuaries, pet kennels, horse barns, dairy farms, or anywhere outdoor watering holes are needed. Each 6 tablet package of Stock Tank Defense can treat up to a 150 gallon stock tank for 3 months. Use 1 Stock Tank Defense Tablet for every 150 gallons of water. Simply toss the required number of tablets into each stock tank. The tablets will instantly sink to the bottom of your tank and begin to dissolve. Bacteria will consume organic debris, improving water clarity and quality. For best results, first clean the stock tank and remove any sludge, debris, and algae. Apply once every 1-2 weeks or whenever a complete water change has been made. For best results, apply tablets when water temperatures are above 50°F. Stock Tank Defense is not an algaecide and will not control algae growing in your stock tank, barrels, or other waterhole equipment. Will not prevent green water from algae growth. Stock Tank Defense is a bacterial treatment, and, when used regularly, it will improve water quality and reduce maintenance.