Water Filter for the LG LFX31935ST (LT700P)

LFX31935ST specifics — where the filter actually lives

Where the filter actually lives: top-left of the fresh-food compartment in most French-door layouts, away from the door bins, a spot that survives trim changes across the LF run. It is a push-twist bay — a push to register, a turn to lock; the sequence is printed on most cartridges for a reason.

Field notes: keep a folded towel under the bay before you open it; the line holds a cup of water even with the valve shut. The LF in LFX31935ST is doing real work: LF is LG’s own coding for French-door machines, and in that format the water path is long enough that a neglected cartridge shows up as flow drop before it shows up as taste. Finish letter sets like ST never alter the bay; the LT700P line fits the whole set.

LF vs LS — what the prefix tells you

The LF prefix sits next to LS in the catalog and the split is cabinet mission: The French-door/side-by-side split tracks the LF/LS prefixes — cartridge fit follows the water path, not the label on the door. capacity 31 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.

LFX31935ST filter questions