Water Doctor GF3 800GPD Replacement Filters – PPC / RO / 3C
In stock and ready to ship
Before you reorder
Match the cartridge, lamp, or filter stage to your existing system before checkout so you do not end up with the wrong replacement part.
Still deciding between replacing a part and solving a broader water problem? Start here first.
Replacement filters for the Water Doctor GF3 800GPD RO system
These Water Doctor GF3 800GPD Replacement Filters are made for the GF3 tankless reverse osmosis system. Choose the PPC, RO or 3C cartridge based on the filter stage that needs replacement.
Compatible system
- Water Doctor GF3 800GPD RO System
Available cartridges
- PPC cartridge for the pre-filtration stage
- RO cartridge for the reverse osmosis stage
- 3C cartridge for the final polishing stage
Best for
- Customers maintaining an existing GF3 800GPD system
- Replacing one cartridge at a time based on usage
- Maintaining flow, taste and everyday system performance
Maintenance note
Replacement timing depends on household usage, water conditions and system indicators. Use genuine Water Doctor GF3 cartridges for proper fit.
Before ordering
Please confirm your system model is GF3 800GPD before purchasing. These filters are not the same as COMO-R700 or COMO-R1000 cartridges.
Product prices do not include installation unless the item is specifically sold as an installation service. Products purchased without installation can be delivered separately. When installation is purchased, delivery and installation are scheduled together and are typically completed within 1 week. Accessories and replacement parts are available for shipping or store pickup only. View warranty details.