Quick take
The OEM cartridge is LG LT1000P. Compatible LT1000P filters can reduce cost, but compare exact certification and fit before ordering.
Correct filter for LFXS26973S
LG’s product specifications and builder documentation list LT1000P as the replacement water filter for this refrigerator.
OEM capacity baseline
LG markets LT1000P as a roughly six-month / 200-gallon cartridge, giving buyers a baseline for replacement planning.
Compatible replacements
LT1000P has a large aftermarket. The strongest alternatives document both refrigerator compatibility and their exact NSF certification scope.
Annual cost
At two replacements per year, cartridge price differences compound quickly.