LG's LT number is the cartridge identity. Five families have model answers here; LT900X3 is retained as a catalogue family without an attached refrigerator match.
Published model records
Choose the exact refrigerator model.
Each route keeps the documented device model, filter reference, region and manufacturer sources together. A source review records a documentary check against manufacturer materials; it does not mean the filter was physically fitted or tested.
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Five LT families have model-backed answers
LT500P, LT600P, LT700P, LT800P and LT1000P remain separate cartridge families. A larger LT number does not mean it replaces the earlier one.
LT900X3 is published in the catalogue but has no appliance-model answer here. Confirm the refrigerator with LG before treating that reference as a fit.
A listed cartridge family does not establish fit for an unlisted appliance. Amazon products and reference searches, manufacturer pages and retailer pages are labelled separately. Amazon links are paid links.
Use the exact refrigerator model and cartridge family. The LG LT families are separate filter designs.
Officially documented 3-tier filtration bundle. Exact appliance compatibility remains unresolved in this source set.
The official LG US product route is currently broken. Other listings for ADQ73753313 describe an assembly and do not prove the complete LT900X3 three-stage bundle, so no direct product is selected here.
US cartridge reference. Choose a refrigerator model separately to establish fit.
LT1000P maps to AGF80300705: Amazon US title names LG LT1000P and part-number variants; product details name LG AGF80300705, 1 count / 1 pack. AGF80300705 is an alias on the LG manufacturer cartridge record.