A crucial element of pond care is algae control. Quickly eliminate algae, green water, string algae, and algae blooms, and keep it gone with GreenClean algaecides. GreenClean Granular is great for eliminating blue/ green and string algae in water gardens, ornamental ponds, water falls, rocks, fountains and is suggested to be used at the first sign of growth. GreenClean Liquid is better for green water or pea soup (planktonic) algae. It moves to the bottom making it highly effective in deeper waters.