The Neoprene Algae Block Sleeve will slip over all standard clear housings to customize your indoor hydroponic garden. Blocks light so no algae can grow. Easy to remove to check the status of filters. Fits Stealth RO, Small Boy™, Triton™, or any other standard housing.

Use the Hydrologic reverse osmosis water filter Algae Block - clear filter housing sleeve to customize your indoor hydroponic garden. By blocking light from entering the clear filter housing you can prevent the development of algae and other biofilms from developing in the filters. Perfect for those who install their RO system in an area with lots of direct light.