Description
The RO Membrane 400 GPD is a high-flow residential reverse osmosis element designed for tankless and direct-flow RO purifiers. Instead of slowly filling a storage tank, these systems purify water on demand when you open the tap. That needs a larger membrane with much higher output than a standard 75 GPD element. The 400 GPD membrane provides that flow while still removing dissolved salts, heavy metals and microorganisms.
Where the RO Membrane 400 GPD is used
- Tankless under-sink RO purifiers rated around 400 GPD
- High-flow RO systems with a booster pump
- Small offices, clinics and cafés needing fast drinking water
- Upgrading older systems for higher daily output
Membrane housings for 400 GPD elements are larger than standard 1812 housings, and many tankless purifiers use a proprietary cartridge. Send us your purifier model or a photo of the old membrane so we can confirm the correct replacement.
Key features
- Thin-film composite polyamide membrane
- High rated output of around 400 gallons per day (approx. 1,500 L/day)
- Designed for pump-assisted, direct-flow systems
- High salt rejection when operated at the rated pressure
- Available in standard element and cartridge formats
Typical specifications
| Rated flow | 400 GPD at test conditions |
| Membrane type | TFC polyamide |
| Typical sizes | 2012 / 3012 or system-specific cartridge |
| Operating pressure | Pump-assisted (typically 80–100 psi) |
| Max feed temperature | 45 °C |
Performance in Oman
Output depends on feed water temperature, pressure and TDS. In summer, warmer water increases flow; in winter it drops slightly. Higher TDS tanker water reduces output and increases the load on the membrane. A correctly matched RO Membrane 400 GPD and pump gives fast flow without sacrificing water quality. Browse other membrane sizes in our RO membranes range, or see our tankless RO systems.
Replacement interval
Most high-flow membranes last 2 to 3 years with regular pre-filter changes. Replace when TDS at the tap rises or flow drops noticeably. Always replace the composite or carbon pre-filter at the same time, since chlorine destroys RO membranes. Learn more about reverse osmosis on Wikipedia.
Frequently asked questions
Can I put a 400 GPD membrane in my old 75 GPD system? Not directly. It needs a larger housing, a pump and a matching flow restrictor.
Will it waste more water? Modern high-flow systems are usually more efficient than older tank systems, with better recovery.
Can you fit it for me? Yes, our technicians replace membranes across Muscat.
Order the RO Membrane 400 GPD in Oman
Farz Water supplies replacement membranes from Muscat with delivery across Oman. Contact us or call / WhatsApp +968 9455 4533.
Reviews
There are no reviews yet.