Atlas Hydra Rainmaster Duo filter kit for non-potable rainwater 90 micron mesh 10 micron carbon blockAtlas Hydra Rainmaster Duo filter kit for non potable rainwater 90 micron mesh 10 micron carbon block A Hydra Rainmaster Duo self cleaning filter with 1 inch BSP(F) plastic inlet outlet with 90 micron stainless steel mesh filter moulded to a second 10 inch Standard housing containing a 10 micron eco friendly carbon block filter cartridge Specially Designed for sediment filtration on non rain water supplies Flow rates up to 91 lpm, however note that