Kenmore UltraFilter / Whirlpool Compatible TW30-1810-36 TFC Membrane This can be a Reverse Osmosis TFC membrane which will have compatibility the Kenmore UltraFilter 150, 300, 350 and 500 R.O. techniques. This membrane may also have compatibility the Whirlpool WHER12 R.O. system. The compatible pre and post filters are the WSK-1 clear out set. This TFC membrane will scale back all total dissolved solids out of your drinking water. Expected membrane existence is 2 to 4 years, with annual clear out adjustments.