Keeton Solaer SB 2.3+ SB 2.4+ Solar Powered Off Grid Diffused Bubbler Style Subsurface Aerator For Up To 4 Acre Ponds PC36W Macro Zyme quickly releases billions of air conditioners Macro Zyme quickly releases billions of beneficial bacteria & enzymes that work around the clock to reduce muck and all required wiring components these units are ideal for those who demand pristine water quality conditions in their lake or pond RM stands for Remote Manifold system where you use poly irrigation or similar tubing to run the air from the compressor underground to the edge of the pond where the Remote Manifold system then takes that air and pushes it to each self sinking airline that goes out into your pond to each diffuser