The Resideo 50046086-001 Replacement Sediment Filter kit is needed for the better performance of your TrueSTEAM humidifier. This kit consists of one sediment filter and one reverse osmosis filter and is intended to be used together with your RO filter control system. #Resideo #50046086-001 #Replacement1SedimentFiltersFilterControlSystem #Resideoparts #PartsHnC #PartsHnCBuzz #HVACPa... https://www.partshnc.com/50046086-001-resideo-1-sediment2-ro-fltr-flo-ctl