Here at Warehouse Aquatics we can\'t recommend this product highly enough - from speaking to thousands of fishkeepers and using the product ourselves we haven\'t found anything better on the market. This product simply works. Blanket Answer is a unique formula which seeks to succeed where many commercial bacteria cultures will fail and is currently the best selling Blanketweed remover on the market. Blanket Answer is simply added to the pond by pouring the mixed powder and pond water from a designated watering can evenly over the surface. The pond will initially take on a milky appearance, but this will clear after about 5 days. The ingredients will form a powdery layer on the liner face. Important : As with most water treatments and conditioners, the pond should have a good level of oxygen saturation. For optimum results use in water temperature of more than 10 degrees centegrade. During and after applying, wash hands, and store the product in a dry place away from the reach of children. The introduction to the pond of any other chemical or treatment should be at least 10 days from the application of Blanket Answer. Blanket Answer will start to work immediately, and will contribute to the filter mediums staying cleaner. Remember, nothing is to be gained by applying a higher than recommended dose . 1 x 800 gram bottle will treat ponds up to 10,000 litres .1 level scoop treats 285 litres (65 gals). Does not harm plants, fish or biological filtration systems Special Note : Most users of Blanket Answer have found that after one dose no more has been required. But in the unlikely event, more can be added later if needed. For best results use Cloverleaf Sludge Answer after treatment to remove detritus from the dead blanket weed - see related products. See related products for other sizes available