Half Off Ponds PDSW2 - Weighted Diffuser Station with (2) 10" EPDM Diffuser Disc for Deep Water Subsurface Aeration Pond Aeration Micro Bubble Membrane Diffuser Discs are an important component in establishing and maintaining a healthy pond environment. 10" Diffuser discs produces high oxygen transfer micro bubbles to help keep fish healthy and ponds clear. includes (2) 10" EPDM Diffuser Discs and Steel Frame Aeration Pump and tubing are not included., 10" Diffuser discs produce high oxygen transfer micro bubbles to help keep fish healthy and ponds clear. Increases oxygen levels for healthy and happy fish. Promotes growth of beneficial Biologicals Lowers levels of dissolved toxic gases and ammonia. Reduces sludge build-up on pond bottoms. Helps maintain an open-water hole in the ice during winter to release trapped toxic gases.