How to Flush a New Refrigerator Water Filter: Gallons and Minutes by Brand

A new refrigerator water filter is not ready the moment it clicks in. The cartridge arrives dry, with loose carbon fines on the block, and installing it pushes air into the water line. Flushing is the step that clears both. The makers quantify it differently — gallons, glasses or minutes — so here are the figures from the manuals and support pages, and what the first cloudy water means.

The flush volumes, by maker

When your cartridge's own sheet gives a figure, that figure wins. When it does not, flush the larger of the numbers above for your brand; there is no downside to two and a half gallons through a filter rated for two hundred.

Why the first water is cloudy, and why it sputters

Whirlpool's page names both causes: "Installing a new water filter often introduces trapped air into the refrigerator's water system", and "New filters may also release a small amount of harmless carbon fines from the filter media." The air is the sputter and the spitting at the dispenser; the fines are the grey tint in the first glasses. The flush "reduces excess air, prepares the filter for use, and removes excess carbon." The LG sheet says the same thing in five words: "remove trapped air and contaminants".

Cloudy water that clears from the bottom of the glass upward is air; it is gone within the flush. Water that stays grey after the full flush volume is a cartridge problem — reseat it, and if it persists, it is the wrong cartridge or a bad one.

How to do it

1. Install the cartridge and turn it until it locks or seats, aligning the marks; do not force it past the stop.
2. Hold a large container under the dispenser and run it. Expect spitting for the first few seconds — that is the air leaving.
3. Count the volume: a gallon is about four full 32-ounce containers. Samsung's 1 gallon, Frigidaire's 1 gallon, GE's six glasses, LG's 2.5 gallons.
4. Pause if the dispenser motor warms; most manuals cap continuous dispensing, and the flush does not have to be one pour.
5. No dispenser? Whirlpool: fill and discard three full ice containers.
6. Then reset the filter light.

If it keeps dripping after the flush

Air in the line is the usual reason a dispenser drips right after a change, and the flush clears it. If the drip continues, the next checks are the seal and the seat — Whirlpool's list is O-ring, alignment, housing — covered in the dispenser-dripping guide.

Buying the next cartridge? Every family page prices each listing per filter, so a 3-pack is compared to a single on equal terms: all filter numbers, or look up your model.

Sources

• Samsung RF4287HARS/XAC and RF4267HARS/XAA owner's manuals, held in our manuals archive; Samsung support, "How to replace the water filter in a Samsung refrigerator".
• LG LT1000PFFN-0000266 instruction sheet (lg.com), held in our manuals archive.
• GE GDE21EGKWW owner's manual (geappliances.com), held in our manuals archive.
• Frigidaire use-and-care guide, publication A26331101 (frigidaire.com), held in our manuals archive.
• Whirlpool Product Help, "Cloudy Water Being Dispensed".