Water Filter for the LG LMXS30746S (LT800P)

LMXS30746S specifics — where the filter actually lives

Finding the bay is the easy part — this chassis puts it in the fresh-food compartment — exact spot varies by dispenser layout — usually a kneeling-height or shoulder-height swap, not a teardown. It is a push-twist bay — press, quarter-turn, finished — the two-step seat keeps the o-ring from dragging on installation.

The recurring owner notes: run the first gallon or two through a fresh cartridge before drinking — carbon fines are normal — and reset the indicator so the countdown matches reality. The LM prefix is the tell: it places the machine in LG’s 4-door Max family, which pins down the cartridge line, the reset behavior, and the service documentation worth consulting. Finish letter sets like 6S never alter the bay; the LT800P line fits the whole set.

LM vs LF — what the prefix tells you

Two prefixes, two missions: Chassis first: 4-door Max (LM) versus French-door (LF). The shared cartridge line covers both without adaptation. Capacity check: the 30 cubic feet in the code is the box size, and bigger boxes push more water through the same cartridge between swaps.

Swap it in 5 minutes

• Press the release (if fitted), twist the old cartridge free, and pull it from the header.
• Wet the new cartridge’s o-ring with cold tap water so it seats without dragging.
• Push the cartridge square onto the header, then give it the locking quarter turn.
• 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

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.

LMXS30746S filter questions