Quick take
Use LG LT1000P or a verified compatible LT1000P cartridge. The model mapping is explicit on LG’s specifications.
Correct filter for LFXS28968S
LG’s product specifications list Water Filter: LT1000P for LFXS28968S.
OEM baseline
LG LT1000P is the simplest fit decision and provides the OEM performance baseline.
Compatible replacements
The LT1000P aftermarket is broad, so compare exact certification and seller reliability before choosing on price.
Recurring-cost opportunity
Replacement-filter specialists can offer meaningful savings over repeated purchases.