The Culligan Compatible TFM-36A Reverse Osmosis Membrane made by Desal is an 36 gallon per day membrane. The Desal TFM-36A reverse osmosis membrane is a 36 Gallon per Day TFC (Thin Film Composite) membrane that reduces flouride, lead, barium, cadmium, chromium, mercury, nitrate, nitrite, TDS and most other materials from your water.Fits Culligan® models H-8, H-83, AC-15, AC-30, AC15 Aqua Clear