RO700G Reverse Osmosis Membrane
The genuine 700 GPD membrane cartridge for the Aero·RO S9 tankless system — reverse osmosis membrane and carbon post-filter in one twist-off cartridge.
This is the RO membrane cartridge for the Aero·RO S9 tankless reverse osmosis system. It handles stages 4 and 5 of the S9's filtration: a 700 GPD reverse osmosis membrane rated to 0.0001 micron, followed by a built-in carbon rod that polishes the water on its way to your faucet. When the S9's filter life display tells you it's time, twist the old cartridge out and the new one in. No tools, no housings, no mess.
Key Performance Metrics
Cartridge Specifications
| Model | RO700G |
| Fits | Aero·RO S9 700 GPD tankless RO system (RO membrane position) |
| Construction | Polypropylene filter shell, reverse osmosis membrane, carbon rod |
| Membrane Capacity | 700 gallons per day (GPD) |
| Filtration Accuracy | 0.0001 micron |
| Applicable Water Temperature | 41 – 100°F (5 – 38°C) |
| Applicable Water Pressure | 14.5 – 58 psi (0.1 – 0.4 MPa) |
| Service Life | 12 – 24 months, depending on water quality and usage |
| Connection | Twist-lock cartridge — installs from the front of the S9, no tools |
Change the pre-filter first. The CBPA composite pre-filter protects this membrane from sediment and chlorine. Replacing the pre-filter on schedule is the single best way to get the full 24 months out of your RO membrane.
Swapping the Cartridge
- Turn off the feed water to the S9 and open the RO faucet to relieve pressure.
- Twist the RO cartridge to unlock it and pull it straight out of the unit.
- Push the new RO700G cartridge into the same port and twist until it locks.
- Turn the water back on, check for leaks, and reset the filter life indicator per the S9 manual.
- Run the RO faucet to flush the new membrane before drinking.
Ships from California
Stocked in Santa Ana and shipped the same business day on orders placed before cut-off.
Genuine Aero·RO
Factory-matched replacement cartridges made for the Aero·RO S9 by IPW Industries.
Filter Help
Not sure which cartridge is due? Call (877) 541-6603 and we'll walk you through it.

