Supa Pond Blocks Standard

When added to the pond, this block gradually dissolves, releasing di-methyl urea into the water. While completely harmless to fish and beneficial pond plants, it effectively suppresses the growth of waterborne algae. Taking preventive measures is always preferable to treatment, so introducing this item early in the spring will deter algae buildup as the temperature rises.

Pond Block Anti-Algae Pack 6: When placed into the pond, this block slowly dissolves, releasing di-methyl urea into the pond waters. While totally harmless to fish and healthy pond plants, this inhibits the growth of waterborne algae. Prevention is always better than cure, so introducing this item early in the spring will prevent the buildup of algae as the weather warms.