What your feed water does to filter life
Both service intervals are published as ranges, and the water coming into the building is what decides where in the range you land.
Two parts are consumable: the combo cartridge, which holds the sediment and carbon stages, and the RO membrane itself, which does the actual separation.
The ranges are not hedging. Dissolved solids in the incoming water — TDS — are what load the cartridge and foul the membrane, so a hard-water site sits at the lower end of both intervals and a soft-water one at the upper. The manuals set the ceiling for feed TDS at 800 ppm, and above it the system is outside what it was specified for.
Two things upstream matter as much
Free chlorine damages the membrane and has to be removed before the water reaches it — that is part of what the carbon stage is for. Feed temperature matters too: output falls as the water gets colder, and the system must never be allowed to freeze.
The manuals print part numbers for the under-sink platform — LXL-A0002 for the cartridge, LXL-A0001 for the membrane — but not for every model in the range. If yours is a commercial unit, confirm the part with KomiBright before ordering rather than matching on service life alone.