Use LG LT1000P or a verified LT1000P-compatible cartridge. LG also sells LT1000P multi-packs, useful as an OEM cost benchmark.
Correct replacement filter
LG’s LRFS28XBS product page identifies LT1000P as the related water-filter accessory, and LG Canada lists Water Filter Model Name LT1000P.
OEM vs compatible
OEM gives the simplest match; compatible cartridges compete mainly on recurring cost.
What to compare
Fit, certification, cartridge capacity and annual cost matter more than headline contaminant counts.
Replacement planning
LG recommends periodic replacement for LT1000P-family cartridges; use the refrigerator indicator and current instructions.
How to verify fit before buying LG LRFS28XBS Water Filter: Which LT1000P Filter Fits?
Treat compatibility as a model-number decision, not a shape-matching exercise. Start with the appliance or system model label, then confirm the exact cartridge or replacement code listed by the manufacturer. Similar-looking filters can use different tabs, seals, RFID features or bypass interfaces, so a cartridge that appears to fit can still leak, restrict flow or fail to lock correctly.
For aftermarket replacements, separate physical compatibility from filtration performance. A seller can correctly state that a cartridge fits a refrigerator while the contaminant-reduction scope differs from the original filter. If lead, cysts, PFAS or another health-related claim matters, verify the exact replacement model in the current certification or performance documentation rather than assuming an OEM-equivalent claim set.
Compare recurring cost, availability and replacement risk
Replacement products should be evaluated over several service cycles. Multiply the current cartridge price by the realistic replacement frequency, add shipping, and check whether the same model is consistently stocked. A low first-purchase price is less useful if the cartridge becomes difficult to source or if replacement intervals are short.
Watch for vague phrases such as “uses certified media” or “tested to a standard.” Finished-product certification is stronger evidence than a statement about one component. For marketplace listings, clear manufacturer identity, exact model numbers, return policies and traceable certification reduce the risk of counterfeit-style or poorly fitting replacements.