The PuROTwist TQ56-15FC is an encapsulated membrane. The RO membrane housing and the flow control are included with the membrane. There is no need to buy the RO membrane housing or flow control separately.
Features:

• Filters 15 gallons of water per day.
• Omnipure PuROTwist Reverse Osmosis Membranes should be replaced every two years depending on the quality of your water.
• Reduces barium, cadmium, chromium III & VI, copper, flouride, lead, mercury, nitrate, nitrite, radium, selenium, and TDS.