Stock Tank Secret is easy to use and is effective in helping to keep livestock water tanks clean and drinking water palatable for up to two months. To use: Tear off the paper label at the perforation and throw the entire unopened bag into your stock tank. Do not open the bag. Note: One bag is good for an average stock tank that is about two feet wide and five feet long. The amount of Stock Tank Secret needed is based upon surface area, but not depth of the water. For example, one bag is good for ten square feet of surface area, which is a five by two foot tank. How it works: Stock Tank Secret begins working immediately. However, you may not notice its effect for a week to ten days. If your tank had a lot of debris built up along the sides of the tank, it may start coming off in sheets and do so for about a week. Take a shovel or manure fork and fish the floating debris out of the tank. At first your tank may look worse than better, but be patient. The water in the tank will become clear. Replacement: After two months, take the old bag out and replace it with a new bag of Stock Tank Secret. Throw the old bag in the trash or compost bin, it’s completely biodegradable. Other applications: Stock Tank Secret has also been used safely and effectively in large automatic livestock waterers and ornamental ponds, including those with live fish and aquatic plants.