GREEN CLEAN 2-LB BOTTLE GREEN CLEAN: 2-LB BOTTLE $31.99 SKU: GRC02 QTY: Click here to save 5% off of your order! GREEN CLEAN 2-LB BOTTLE Green Clean works by oxidation and provides immediate control of algae in ponds, fountains, and other water features. You'll see visible results within minutes. Safe and effective Green Clean is non-toxic to fish or plants and is biodegradable. One pound (2 cups) treats about 4000 gallons. OMRI certified organic.