Omnipure’s TQ56-50FC encapsulated membrane is compatible with PuROTwist 4000 Reverse Osmosis systems or any system that uses Omnipure Q-Series filters.
Stage four, or (D) is the Reverse osmosis membrane. Filtered water is forced via your house water pressure through a semipermeable membrane. The pores of the membrane are so small that nearly everything besides the water molecule is too big to pass through. When it comes out the other side you have super clean RO water. All the leftover stuff is rinsed off the membrane and pushed out of a drain line into your main drain. The clean water moves to the storage tank until you need it.