1-micron PP yarn sediment water precision filter cartridge 10/20/30/40 inch High salt rejection rate 8040 RO membrane Food grade tablet water softener salt Runxin automatic filtration valve 20T/H 1-micron high flow PP filter cartridge 10/20/30/40 inch Runxin automatic filtration valve 30TPH Industrial Cation Ion Exchange Resin for Water softening Runxin automatic filtration valve 10T/H