Offers an easy, effective way to control and prevent the growth of algae. Leaves pond water crystal clear. Helps keep pond clear from algae when used regularly. Pond block is not recommended for ponds with plants.

Details:
Replace when fully dissolved (usually after 30 days). For best results, place the block in an area of the pond that is calm. Not recommended for ponds with plants.

Size:
4 blocks per package

Treats:
up to 1000 gallons