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Water Filter for the GE ZISS420DRJSS (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:
✓
ZISS420DRJSS specifics — where the filter actually lives
Finding the bay is the easy part — this chassis puts it at the base of the fresh-food compartment in most side-by-side builds — grille or lower rear, the same estate every Monogram built-in side-by-side refrigerator in this family uses. It is a twist-lock bay: seat the cartridge against the o-ring, quarter-turn clockwise, and let the keyed flange do the aligning for you.
Owners of the ZISS420DRJSS report the same friction points: expect the first swap to take longer than the box suggests — aged o-rings grip — so budget ten minutes, not five. One prefix, one chassis family: when GE stamps ZIS on the plate it is sorting the machine into the Monogram built-in side-by-side class — same water path, same cartridge, different cabinet. The SS ending is a finish code — color and handle options, not mechanical ones. Every finish of this chassis takes the same cartridge.
ZIS vs PSS — what the prefix tells you
Know your ZIS from your PSS and the cartridge question halves: ZIS covers Monogram built-in side-by-side, while PSS covers Profile side-by-side. The cartridge line is usually shared across both — order by chassis, not by door count. Size class 42 cu ft — worth knowing because a full household works a cartridge harder than the rated six months assumes.
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.
ZISS420DRJSS filter questions
Filter light reset on the GE ZISS420DRJSS — how?
Hold the filter-reset control a few seconds after seating the new cartridge; placements vary by control panel, and the ZISS420DRJSS manual’s filter-status page has the exact spot.
GE ZISS420DRJSS: bypass plug needed without a filter?
No — run it empty if you like; the MWF bay needs no bypass plug, it simply passes water through untreated.
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 ZISS420DRJSS?
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
This bay takes the OEM MWF. ClearFit verified-fit alternatives for this exact slot are being staged — every compatible option for your fridge is one lookup away.
Check every filter that fits →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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