---
title: "How Long an LG Refrigerator Water Filter Really Lasts in South Florida"
description: "How long does LG refrigerator water filter last in South Florida: why six months is optimistic here, what happens if you leave it, and the air in the line."
url: "https://lgmiami.support/blog/how-long-water-filter-lasts/"
date_modified: "2026-09-05"
Category: "Maintenance & Prevention"
---


# How Long an LG Refrigerator Water Filter Really Lasts in South Florida

## How long does LG refrigerator water filter last? The label says six months

LG rates most of its refrigerator water filters at **six months or about two hundred gallons, whichever comes first** — and in South Florida the gallons tend to run out well before the months do.

Two reasons. The water here carries more hardness and more sediment than the rating assumes, so a cartridge loads faster. And households that use the dispenser as their drinking water — filling bottles rather than running the tap — get through two hundred gallons a great deal quicker than a household that uses it for the occasional glass.

A realistic interval for a family of four that drinks from the door is closer to **four months**. For a couple who use it lightly, six is fine.

## What actually goes wrong if you leave it

Not what most people assume. A loaded carbon filter stops improving the water; it does not start spoiling it. The water does not become unsafe.

What happens instead is that **flow drops**, and the first thing to suffer is the ice maker.

The ice maker has to fill its tray within a time limit. If the water arrives too slowly, the tray fills short — which gives you hollow, small or misshapen cubes — and eventually it does not fill at all, and the machine stops making ice while the dispenser still works well enough that nobody suspects the filter.

That is why *no ice with working water* so often turns out to be a filter nobody has changed. It is the cheapest thing on the whole diagnostic list and it is checked first for exactly that reason.

## After the change: the air

Expect it. A new cartridge has air in it and air in the line behind it, and the machine will not fill a tray it cannot fill cleanly.

**Run four or five liters through the dispenser** into a jug until it stops spitting and the flow is smooth. Then leave the ice maker alone for twenty-four hours before deciding anything — an ice maker produces on the order of two to three pounds a day, so nothing is judged in the driveway.

If there is still no ice after a full day, and the water is running normally, then it is worth looking further: a fill tube frozen at the mouth, or the compartment not staying cold enough. LG codes those last two as **IF** and **IS**.

## The leak that gets blamed on something else

A cartridge that is not turned fully home — a few millimeters short of its stop — weeps. Slowly, and often only when the dispenser is used, which is why the timing gets missed and the water gets blamed on the defrost drain for months.

When you fit a new one, turn it firmly to the stop and then run the dispenser for thirty seconds while looking at the housing with a torch. Thirty seconds of checking saves a very annoying investigation later.

## Third-party cartridges

Certified ones exist and many are perfectly good. The problem we see is not filtration — it is **sealing**. A cartridge whose O-rings are marginally the wrong size fits, turns, and weeps.

If you use a third-party filter and something starts leaking, take the filter out of the equation before assuming anything else: fit a known-good cartridge and watch the housing for a day.

## Two other water jobs worth doing at the same time

**The tank, where the model has one.** Some LG cabinets hold a water tank inside the fresh food compartment rather than running the dispenser straight off the line. It comes out to be washed, and it goes back with a firm push — LG codes a tank that is missing or unseated as **tt**, and a tank put back a few millimeters short produces that with nothing broken.

**The supply line.** Have a look behind the machine once a year. A saddle valve that has been weeping onto a floor for a year is a much larger repair than the one it started as.

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