The Filmtec TW30-1812-50 is a 50 Gallon per Day Reverse Osmosis Membrane. Dow Filmtec TW30-1812-50 Reverse Osmosis Membrane can be used in many brands of Reverse Osmosis Water Filtration Systems. It is NSF/ANSI Standard 58 listed. The home drinking water elements are rated at 50 psi and will purify about 20% more water than competitive elements rated at 60 psi. The maximum operating temperature is 113°F (45°C) and the maximum operating pressure is 300 psig.