Eco-Friendly Water Feature clear is ideal for preventing and removing algae blooms in your water feature. Made from natural organic products, it is safe to use in your garden under the correct dosages and will leave your water feature looking sparkly clear. Prevents Build Up on Algae and slime. Can be used in all types of water features. Contains extract of barley straw. Frog Friendly and Dog Friendly. 250ml – treats up to 200 ltrs (45 Gallons). 500ml - treats up to 400ltrs (90Gallons).