Water Wych a 100% natural pond cleaner that is 98% recyclable. A unique unit that when placed in the pond, absorbs all the impurities in the water. An all natural pond water conditioner and algae control treatment that effectively reduces string algae found in the pond. Clean pond without chemicals, results within 3 to 4 weeks. No straw. Safe for aquatic plants and fish. Dimensions 9"x9"x4.5".