Water Filter for the GE ZISS420DMC (MWF)

Your GE refrigerator takes the MWF slot. Below is every filter that fits — OEM and certified alternatives — with real prices.

✓ 100% compatible — no bypass plug needed

🔧 5-min push-in swap

🇺🇸 Ships from Indiana

ZISS420DMC · Quick Facts

TYPE

refrigerator

YEARS MADE

—

FILTER LOCATION

behind the lower fresh-food trim or base grille in most side-by-side layouts

FILTER SLOT

MWF bay

REPLACE EVERY

Every 6 months

ALSO BRANDED AS

—

Every cartridge that fits this model — pulled live from the catalogue:

Compatible cartridges verified for this model

We cross-checked the ZISS420DMC against every cartridge family that fits its bay. ClearFit versions are on the way — get notified when they land, or find your exact fit now.

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✓

Verified fit for ZISS420DMC. Cross-checked against GE service documentation — this model family uses the MWF bay with no chip or bypass restrictions.

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ZISS420DMC specifics — where the filter actually lives

Where the filter actually lives: behind the lower fresh-food trim or 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: the bay wants the cartridge offered flat, rotated a quarter turn, and nothing more — hand pressure only.

The small print owners learn the hard way: the line is still live when you open the bay, so keep a towel in reach, and expect the filter-status light to need a reset before it believes the new cartridge. The ZIS prefix is the tell: the ZIS run is GE’s Monogram built-in side-by-side series; across the run, the filter bay is one of the constants. That MC suffix is trim-level shorthand. GE kept the MWF bay common to every finish in the line.

ZIS vs PSS — what the prefix tells you

Catalog shorthand: Monogram built-in side-by-side versus Profile side-by-side. Both generations draw from the same cartridge pool, so the prefix is a fit-check, not a barrier. Cabinet decode: 42 cu ft — the number that tells you whether this cartridge feeds a family-size dispenser or a compact one.

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.

ZISS420DMC filter questions

Filter light reset on the GE ZISS420DMC — how?

Press and hold the reset control until the light clears (a few seconds), with the new cartridge already seated — the ZISS420DMC owner’s manual lists the button location for your control panel.

Does the GE ZISS420DMC need a bypass plug when the filter is out?

You can, but unfiltered — the MWF bay needs no bypass plug; it just passes water through without filtering while the cartridge is out.

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 ZISS420DMC?

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

OEM MWF cartridge

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 →