Unlike other aquatic algaecides on the market today, GreenClean Granular Algaecide works on contact to control algae in water gardens, ornamental ponds, fountains, and other water features. Through its patented formula, GreenClean Granular Algaecide immediately begins fighting algae blooms, releasing vital oxygen into the water body as it biodegrades. Benefits include:. EPA Registered. Can Be Applied in Water Containing Live Fish and Plants. Works on Contact to Control All Types of Algae. Results Can be Seen within Minutes. Professional Strength Formula. Non-Copper Based Alternative. 2 lb.