Pond One Pond Algae Control Blocks 4 X 20g

Pond One Algae Control Blocks are an easy-to-use solution to remove algae from your pond. Simply drop the block into your pond and let it dissolve, leaving your pond crystal clear and algae free. These blocks can be used to prevent algae, or to clean an algae infested pond.  One square piece (5g) treats 200L of water, and blocks will dissolve over 7-14 days depending on the water conditions.