Pond AlgaeFix will control many types of green or green water algae as well as hair algae and blanketweed. Helps with existing algae and prevents new blooms from occuring. Safe for use in ponds with both plants and fish, however this product should not be used where crabs, shrimp or freshwater lobsters are present. AlgaeFix is non-corrosive and colorless. When using this product there should be adequate aeration in the pond. If there is no vigorous aeration oxygen levels will drop and fish loss may occur. Sorry, but we cannot ship this product to either the State of New York or Canada.