Membrane, Dow Filmtec � TW30-1812-24 24 GPD TFC RO reverse osmosis membrane - standard size 1.75" X 11.75"
Standard size membrane can be used as a replacement for most TFC model Reverse Osmosis.
This TFC Membrane works on Well or City water supplies.
If you are on chlorinated "city" water, you should use a Carbon Block Prefilter ( like our CTO 2 - 5 Micron 10" Carbon Block - 633225E12 ).