Water Filter for the LG LMX25984SB (LT600P)

LMX25984SB specifics — where the filter actually lives

On the LMX25984SB, the cartridge inside the fresh-food cavity, position varying with dispenser spec, a spot that survives trim changes across the LM run. It is a push-twist bay — the keyed entry means no cross-threading, and the locking turn is short enough to do one-handed.

Order-day practicalities: keep a folded towel under the bay before you open it; the line holds a cup of water even with the valve shut. The badge reads LMX25984SB, but the chassis reads LM: the LM run is LG’s 4-door Max series; across the run, the filter bay is one of the constants. Finish letter sets like SB never alter the bay; the LT600P line fits the whole set.

LM vs LF — what the prefix tells you

The LM prefix sits next to LF in the catalog and the split is cabinet mission: LM means 4-door Max, LF means French-door. For filter shopping the distinction matters less than you would think — same line, different cabinet. capacity 25 cubic feet: a mid-to-full-size cabinet whose dispenser traffic sets the realistic change cadence.

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.

LMX25984SB filter questions