Removal Capabilities: Woder WD-FRM-REP Cartridge for up to 95% of Fluoride Removal.
The WD-FRM-REP cartridge is the first stage replacement cartridge for the following dual stage systems:
Woder WD-D-FRM-G4-DC Water Filtration System.
Woder WD-D-FRM-G4-JG Water Filtration System.
Cartridge lifespan: 1 year under warranty.
Selective Filtration™
Our proprietary Selective Filtration™ technology removes 99.9% of contaminants while leaving in all essential minerals. Reverse Osmosis (RO) filters also remove 99.9% of contaminants, however, RO also remove ALL the minerals found in tap water – including minerals your body needs. RO systems can waste thousands of gallons of water annually while flushing out contaminants down the drain.
Fluoride Removal Replacement Cartridge – Gen4 (WD-FRM-REP)
If you’re already running one of our dual-stage fluoride removal systems, the WD-FRM-REP is the fluoride replacement filter cartridge built specifically to fit it. This is a cartridge-only order, meant for existing WD-D-FRM-G4-DC or WD-D-FRM-G4-JG owners who need a fresh part rather than a new full system, so there’s no housing, no fittings, and no extra hardware included, just the internal media itself. It’s also commonly referred to as an frm cartridge for short, matching the model naming printed on the housing. Whichever housing you own, under-sink or inline, this is the correct reorder part, there’s no separate version to track down for each one, both use the exact same internal media and the same dual-stage design that came with your original system. Reordering this way, rather than a full new system, is the standard path for existing customers once their current part reaches the end of its useful life, and it’s how most of our repeat customers keep their setup running at the same level of performance year after year without paying for a housing they already own.
What This Cartridge Removes
This part combines dual-stage fluoride removal media with our standard Gen4 Advanced stage, the same combination that powers your original system. As a fluoride cartridge filter, it doesn’t change what your system does, it just refreshes the media inside so performance stays where it started. Anyone running a fluoride removal cartridge from us should expect the same non-RO fluoride reduction they had on day one, without wasted output or mineral stripping, since the media targets that one contaminant specifically rather than forcing everything through a membrane. That’s the core difference from a reverse osmosis approach: the calcium and magnesium your body actually wants stay in your glass, while the one substance you’re managing still comes down to a level you’re comfortable with. Nothing about the underlying chemistry changes between your first cartridge and this one, so there’s no adjustment period or retesting needed once it’s installed, performance simply picks up where the previous part left off.
When to Replace
Knowing when to swap this fluoride removal replacement filter comes down to a few signs: a noticeable drop in flow rate at your faucet, levels creeping back up if you’re testing your supply periodically, or simply hitting the part’s expected cartridge lifespan listed on the product page. Tracking your install date is the most reliable way to stay ahead of a worn-out part rather than waiting for a symptom to show up first, since performance on a spent cartridge tends to decline gradually rather than stopping all at once, which makes it easy to miss if you’re not watching for it. A quick note in your phone’s calendar around the listed lifespan is usually all it takes to stay ahead of it, and reordering a little early costs far less than running an under-performing system for months without realizing it.
How to Replace It
Replacing it is a quick job either way. For the DC (under-sink) housing, it’s a simple unscrew-and-swap; for the JG (inline) version, it’s a push-to-connect change, no tools needed beyond what came with your original system. Our install guides walk through the specific steps for each housing type, so you’re not guessing at the process regardless of which one you own. Ordering a compatible replacement cartridge going forward is just a matter of bookmarking this product page for the next time it’s due, most repeat customers find it faster than searching the site again from scratch. This part is designed and packaged in the USA.
Frequently Asked Questions
Which Woder systems is this replacement cartridge compatible with?
It’s built for our WD-D-FRM-G4-DC (under-sink) and WD-D-FRM-G4-JG (inline) dual-stage fluoride removal systems, matching the media combination in both housing types.
How often should I replace the fluoride removal cartridge?
Watch for a drop in flow rate or check the expected lifespan listed on the product page. Tracking your install date is the most reliable way to stay ahead of performance decline.
How do I install the replacement cartridge?
It depends on your housing type: the DC version unscrews for a straightforward swap, while the JG version uses a push-to-connect change. Our install guides cover both processes step by step.
