Blue Water filter control valves ISO9001:2000 Factory min.1set OEM/ODM 1500- ... (6600, 6800, 7800, 8600, 8,800) are optional as hot water system (temperature ≤65 °C, 150 ° F). Part time model valve can ... when regenerate control valvesautomatically block water softener device effluent pipeline, do not let without handle hard water system, the BLUEWATER control valves, all ...