Whirlpool WHEERM RO Membrane

http://www.waterfilters.net/Whirlpool-WHEERM-Reverse-Osmosis-Membrane.html
The Whirlpool WHEERM is the UltraEase replacement membrane for the Whirlpool WHER25 reverse osmosis system. The Whirlpool WHEERM RO Membrane has been certified and tested against NSF/ANSI standard 58 for the reduction of total dissolved solids and organic matter and has a rejection rate of 90-95%. The WHEERM Reverse Osmosis Membrane typically lasts a year, depending on your water's pH level and hardness. The membrane should be replaced after a decrease in water pressure or quality or when TDS reductions drops below 75%.