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Water Filter for the Monogram ZISW420DRI (MWF)
✓ 100% compatible — no bypass plug needed
🔧 5-min push-in swap
🇺🇸 Ships from Indiana
Every cartridge that fits this model — pulled live from the catalogue:
✓
ZISW420DRI specifics — where the filter actually lives
On the ZISW420DRI, the cartridge low on the fresh-food side or behind the base grille in most side-by-side layouts — usually a kneeling-height or shoulder-height swap, not a teardown. It is a twist-lock bay: no tools, no housing removal, and the cartridge indexes in only one orientation despite looking symmetric.
The recurring owner notes: the reset control is the step everyone skips; the light will not acknowledge a new cartridge on its own. The badge reads ZISW420DRI, but the chassis reads ZIS: the ZIS run is GE’s Monogram built-in side-by-side series; across the run, the filter bay is one of the constants. Finish letter sets like RI never alter the bay; the MWF line fits the whole set.
ZIS vs PSS — what the prefix tells you
Two prefixes, two missions: The door count differs — Monogram built-in side-by-side against Profile side-by-side — but the bay and the cartridge order do not. 42 cubic feet of cabinet — the dispenser sees heavy traffic at that size, and heavy traffic ages cartridges faster.
Swap it in 5 minutes
- Twist the old cartridge a quarter turn counterclockwise and pull it straight down — keep a towel in reach for the dribble.
- Fill the new cartridge with cold tap water so the chamber is not fighting an air pocket.
- Offer the new cartridge to the bay, push up, and twist a quarter turn clockwise until the stop catches.
- Run two gallons through the dispenser to flush carbon fines, then hold the filter-reset control until the status light clears.
What this filter takes out of your water
| What it targets | Standard that covers it |
|---|---|
| Chlorine taste & odor | NSF/ANSI 42 — aesthetic effects |
| Particulates, Class I | NSF/ANSI 42 — fine sediment |
| Lead | NSF/ANSI 53 — health effects |
| Cysts (cryptosporidium, giardia) | NSF/ANSI 53 — microbial |
| PFOA & PFOS | NSF/ANSI 53 (P473) — varies by cartridge |
Coverage above lists what the standard addresses, not a performance claim for any specific cartridge — removal claims vary by certificate, so check the NSF listing for the exact part number you are buying.
ZISW420DRI filter questions
GE ZISW420DRI: how do I clear the change-filter light?
The reset is a press-and-hold on the filter control with the cartridge in place; check the ZISW420DRI owner’s manual for where that control sits on your panel.
GE ZISW420DRI: bypass plug needed without a filter?
No — the MWF bay seals on the cartridge itself, so removing it just means unfiltered water until the next change, not a leak.
Are off-brand filters safe for a GE refrigerator?
Certified aftermarket cartridges are built to the same NSF test standards as the OEM part, and federal warranty law (Magnuson-Moss) protects your coverage when you use them.
Why is the OEM MWF cartridge so much more expensive?
Part of the OEM price is the badge and the distribution chain. Certified alternatives meet the same test standards at a lower unit price, especially in multi-packs.
How often should I replace the filter in my ZISW420DRI?
Every six months or at the rated gallon capacity, whichever comes first — the MWF class cartridges all share that service interval.
Do I need to turn off the water supply to change it?
No — the bay is designed for a live swap. Expect a small dribble, keep a towel in reach, and flush a couple of gallons through the new cartridge before the first glass.
Every filter that fits your fridge
| Cartridge | OEM MWF | RECOMMENDEDMWF Replacement Water Filter · 1-Pack – ClearFit | MWF Replacement Water Filter · 3-Pack – ClearFit | MWF Replacement Water Filter · 6-Pack – ClearFit |
|---|---|---|---|---|
| Price | OEM list | $14.99 | $37.47 | $67.44 |
| Verified fit | ✓ the bay cartridge | View & buy → | View & buy → | View & buy → |
This filter expires six months from today
Your HVAC filter is probably on a different cycle. Track them all in one place.
months until this filter should be replaced (200-gal rated life)
Free tool · tracks fridge + HVAC + whole-house · auto-refill optional
More models using this filter
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