Water Filter for the LG LMX25981SB (LT600P)

LMX25981SB specifics — where the filter actually lives

On the LMX25981SB, the cartridge in the fresh-food compartment — exact spot varies by dispenser layout, a deliberate placement that keeps the swap away from the door seals and drawer rails. It is a push-twist bay — seat first, rotate second — reversing the order is the only way to fight this bay, and it will not let you.

Practical notes from the install forums: carbon fines in the first pours are normal for a fresh bed, and the filter timer only restarts when you hold the reset. Decode the plate and the parts question answers itself: 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. That SB suffix is trim-level shorthand. LG kept the LT600P bay common to every finish in the line.

LM vs LF — what the prefix tells you

Two prefixes, two missions: split by cabinet mission (4-door Max versus French-door), joined by cartridge line — that is the LM/LF story. Size class 25 cubic feet — worth knowing because a full household works a cartridge harder than the rated six months assumes.

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.

LMX25981SB filter questions