Check the listing for details. USA SpectraPure Spectra-Select Compatible Membrane, 90 GPD. Condition: New. Listed at 34.00 USD. (1pc) 90 gpd Membrane Reverse Osmosis Compatible Spectrapure 90 GPD RO Membrane “not original” SpectraPure Spectra-Select Compatible Membrane, 90 GPD 90 TFC Membrane Spectapure 90 GPD Membrane Filter for Aquarium: This premium quality membrane cartridge fits all standard size RO systems for proper filtration of make-up aquarium water - Polyamide membrane material with a negative charge removes harmful substances - 11-3/4" standard size fits Spectrapure and other brands of RO units - Spiral-wound and tape wrapped element ensures a long two-year life. 1.75" x 11.75" Residential Tap Water Membrane - 90 GPD Compatible/Replacement Rated at 50 psi and will purify about 20% more water than competitive elements rated at 60 psi. Membrane Life: 2-5 years NSF/ANSI Standard 58 listed FREE SHIPPING