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Water Filter for the GE ZISS420NRDSS (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:
✓
ZISS420NRDSS specifics — where the filter actually lives
On the ZISS420NRDSS, the cartridge behind the lower fresh-food trim or base grille in most side-by-side layouts, the same estate every Monogram built-in side-by-side refrigerator in this family uses. It is a twist-lock bay: no tools, no housing removal, and the cartridge indexes in only one orientation despite looking symmetric.
The small print owners learn the hard way: flush before the first glass — new carbon beds shed fines for the first gallon or so, which is cosmetic, not contamination. Read the prefix and the maintenance writes itself: GE uses it across the Monogram built-in side-by-side range, which means shared cartridge economics — one media family, dozens of cabinet variants, all drinking from the same parts catalog. The SS tail marks finish variants of one chassis; the filter bay is shared across the entire finish range.
ZIS vs PSS — what the prefix tells you
Two prefixes, two missions: 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. 42 cu ft 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.
ZISS420NRDSS filter questions
GE ZISS420NRDSS: how do I clear the change-filter light?
Hold the filter-reset control a few seconds after the swap; the status light clears only with a seated cartridge, and the ZISS420NRDSS manual maps the control by panel type.
Does the GE ZISS420NRDSS 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 ZISS420NRDSS?
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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