GE FQK1K Under-Sink Water Filter

GE FQK1K Under-Sink Filter Replacement Cartridge

The GE FQK1K is the replacement cartridge for GE single-stage under-sink filtration systems, including the GX1S01R. If your kitchen tap water has picked up a chlorine smell, a flat or chemical taste, or visible sediment, this is the cartridge your system was built around. It filters the cold water line under your kitchen sink, so every glass you pour, every kettle you fill and every pot you put on the stove starts with cleaner water. One cartridge lasts about 6 months, and when it is time to change it, the twist-on design means the job takes minutes — no plumber, no special tools, and no need to shut off the water to the whole house.

Under-sink filtration lives or dies by its cartridge. A fridge filter only serves one dispenser and one ice maker, but an under-sink system quietly handles the hardest-working tap in the house: drinking water, morning coffee, cooking water, rinsing fruit and vegetables, filling bottles before school and work. The FQK1K reduces lead, chlorine taste and odour, sediment, and other common tap-water contaminants, so the water at your kitchen tap tastes clean whether it goes in a glass, a kettle or a cooking pot.

Why Choose the GE FQK1K

The FQK1K is a popular choice because it is the exact cartridge GE specifies for its single-stage under-sink systems. That matters more than it might sound. Under-sink cartridges are not interchangeable tubes — the head under your sink is machined for one cartridge shape, and only the correct cartridge seals properly and filters the way the system was designed to. When you order an FQK1K for a system that takes an FQK1K, you are not guessing at a “close enough” fit. You are restoring the system to its original specification.

Owners choose this cartridge for a few practical reasons. It handles the contaminants people actually notice in tap water: the chlorine taste that makes a glass of water unappealing, the odour that hits you when you fill a kettle, sediment that leaves grit at the bottom of a glass, and lead — the contaminant nobody can see or taste but nobody wants in their family’s water. It also keeps the rhythm simple: one cartridge, roughly every 6 months, changed by hand in minutes. There is no backflushing, no sanitising routine and no service contract. Twist the old one out, twist the new one in, flush, and the system is back to work for another half year.

Compatible Under-Sink Systems

The FQK1K fits GE single-stage under-sink filtration systems, including the GX1S01R. “Single-stage” means the system has one cartridge head under the sink: all of the filtration happens in this one cartridge. If your system has two cartridge heads side by side, you have a dual-stage system and this is not your cartridge — dual-stage systems take the FQK2J cartridge pair instead.

GE Single-Stage Systems (GX1S01R)

The GX1S01R is GE’s single-stage under-sink filtration system, and the FQK1K is its specified replacement cartridge. If your home has a GX1S01R installed under the kitchen sink, this is the only cartridge number you need to remember. The system is usually found mounted inside the sink cabinet, connected to the cold water line, sometimes feeding the main tap and sometimes a dedicated drinking-water faucet.

How to Confirm the FQK1K Is Your Cartridge

The ten-second check: open the cabinet under your kitchen sink and read the label on the cartridge that is installed right now. If the label says FQK1K, this is your replacement — match it exactly and order with confidence. If the old cartridge is missing or the label is unreadable, check the system head for the system model number (GX1S01R takes the FQK1K), or look at the paperwork from when the system was installed. Match the cartridge number, not the shape: cartridges from different systems can look similar on a shelf but will not seal correctly in the wrong head.

What the FQK1K Reduces — and How It Works

Your system’s cold water line runs through the FQK1K cartridge before it reaches the tap. As water passes through the cartridge, the filter media goes to work on the things municipal treatment leaves behind and the things old plumbing can add. Chlorine — added by water utilities to keep water safe in transit — is the main cause of the taste and odour most people describe as “tap water taste,” and reducing it is what makes the biggest everyday difference to a glass of water. Sediment — rust flakes, sand and scale particles — is caught before it can reach your glass or build up in your kettle. And the cartridge reduces lead, which can enter water from older pipes, fittings and solder, and which no amount of standing or boiling removes.

The result is water that simply tastes like water: clean in a glass, neutral in tea and coffee so the flavour you paid for comes through, and better for cooking, where water is an ingredient in everything from rice and pasta to soups and sauces. Ice made from a separate fridge maker is a different line, but everything at the kitchen tap runs through this one cartridge — which is exactly why changing it on time matters.

Fresh Water for Everyday Use

Most households are surprised how much of their water comes from the kitchen tap once a filter is under the sink. Morning coffee and tea. The water bottle filled before the gym. The jug kept in the fridge for cold drinks. Rinsing berries, washing salad, soaking rice. With the FQK1K in place, all of it is filtered — not just the water from one dispenser door. Families who drink a lot of water notice the difference in the simplest way: people stop avoiding the tap. Keeping a fresh cartridge in the system also protects the system itself, because a cartridge left long past its life lets flow slow down and lets the taste creep back in, which is usually the first sign owners notice that a change is overdue.

Easy to Replace — Step by Step

Changing the FQK1K is a minutes-long job you can do yourself. You do not need a plumber, and you do not need tools beyond a towel for drips:

1. Clear a little space under the sink and put a towel or a shallow tray beneath the system head to catch drips — a small amount of water always escapes when a cartridge comes out.
2. Grip the old cartridge and twist it out of the system head, following the direction marked on the system. It should release by hand; steady pressure is better than force.
3. Note the label on the old cartridge as it comes out — that number is your confirmation that the FQK1K is the right replacement.
4. Push the new FQK1K cartridge up into the head and twist it in until it seats firmly. It should feel locked, not loose — a cartridge that is not fully seated is the usual cause of drips after a change.
5. Turn on the cold tap and flush the system (next section), and check around the head for any weeping. If you see a drip, twist the cartridge out and reseat it once more.
6. Note the date on your calendar or on the cartridge itself. This cartridge should be changed again in about 6 months.

Flushing the New Cartridge

Always flush a new cartridge before drinking. Run the cold tap for several minutes and let the water run clear — new filter media releases loose particles and trapped air at first, and the water may look cloudy or taste “new” for the first flush or two. That is normal and it clears quickly. Discard the flushing water (it is ideal for plants or cleaning), then the system is ready for normal use. If your tap splutters for a few seconds on first use, that is just air leaving the line.

When to Replace Your FQK1K

One cartridge lasts about 6 months in a typical household. Replace it sooner if you notice the signs of a tired cartridge: the chlorine taste or odour returning, flow from the tap slowing down, or sediment showing up in a clear glass again. Heavy water use — large families, home cooking for every meal, filling bottles all day — works a cartridge harder and can shorten its life, so go by the calendar and the taste together, and never leave a cartridge in for a year “because the water still runs.” A saturated cartridge keeps passing water while quietly stopping the capture work it exists to do.

Pack Sizes and Value

The FQK1K is sold in four pack sizes, all with free US shipping on any amount — there is no minimum order:

At $35.99 for a single cartridge, filtered water at your kitchen tap works out to roughly $6 a month — far less than bottled water for the same household, with no plastic to haul home or throw away. Because shipping is free on any order size, there is never a penalty for ordering just one cartridge. Even so, most owners take a 2-Pack or larger: the cartridge you need in 6 months is already in the cupboard when the change date arrives, so the system never sits overdue while you wait for a delivery, and you place one order instead of two, three or four. A 4-Pack is two full years of filtration handled in a single purchase.

A Reliable Choice for Clean Tap Water

If your home runs a GE single-stage under-sink system, the FQK1K is not one option among many — it is the cartridge the system specifies, and keeping it fresh is the whole maintenance routine in one small job. Genuine-fit, six-month life, a change you can do by hand while the kettle boils: that is why this cartridge has stayed the standard answer for GX1S01R owners. Order the pack size that suits your household, change it on schedule, and the tap takes care of itself.

FAQ’s

Here are the frequently asked questions about this product.

What is the GE FQK1K?

The FQK1K is GE’s replacement filter cartridge for single-stage under-sink filtration systems. It installs in the system head under your kitchen sink and filters the cold water line, reducing lead, chlorine taste and odour, sediment and other common tap-water contaminants.

Which systems does the FQK1K fit?

It fits GE single-stage under-sink filtration systems including the GX1S01R. It does not fit dual-stage systems — those take the FQK2J cartridge pair. The surest check is the label on the cartridge already installed under your sink.

How long does an FQK1K cartridge last?

About 6 months in a typical household. Change it sooner if the taste or odour returns or the flow from the tap slows down.

How do I replace the FQK1K?

Twist the old cartridge out of the system head, push the new cartridge in and twist until it seats, then run the cold tap for several minutes to flush before drinking. No tools and no plumber are needed — just a towel for drips.

Why does the water look cloudy right after a change?

That is trapped air and loose media particles leaving the new cartridge. Run the cold tap for several minutes until the water runs clear; it is normal and only happens on the first flush.

Which pack size should I buy?

A 1-Pack covers about 6 months. The 2-Pack (about 12 months) is the most popular because the next change is already in the cupboard. Shipping is free on any order, so choose by how far ahead you like to plan, not by shipping thresholds.

At Discounted Filter Store every order ships free anywhere in the US — no minimum spend. Orders are processed within 1–2 business days and delivered in 3–5 business days via USPS. Changed your mind? Returns are free within 30 days, with a prepaid label provided.