Water Filter for the LG LSC27921SB03 (LT500P)

LSC27921SB03 specifics — where the filter actually lives

On the LSC27921SB03, the cartridge at the base of the fresh-food compartment in most side-by-side builds — grille or lower rear, a spot that survives trim changes across the LS 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: 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. Read the prefix and the maintenance writes itself: LS is LG’s side-by-side designation proper, and the service literature files every one of these under the same cartridge line. Read the 03 ending as a revision marker — LG used it for running changes, none of which touched the LT500P bay.

LS vs LF — what the prefix tells you

Two prefixes, two missions: Ordering by prefix works because LS means side-by-side and LF means French-door in this catalog — and the cartridge pool overlaps both. The two digits after the letters are the cabinet size: this is a 27 cubic feet refrigerator, which sets how much dispenser work the cartridge does between changes.

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.

LSC27921SB03 filter questions