For the AO Smith Reverse Osmosis System, the annual filter change includes all 4 stages, Carbon and Claryum filters (Stage 1 and 3), ther RO membrane (Stage 2), and the remineralizer (Stage 4).
The Carbon and Claryum filters come in one package
AO-4000 CARBON
ITEM 960787
and the RO Membrane and the Remineralizer come in another package
AO-RO-RM-R
ITEM 960788
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Carbon and Claryum filters - [ Ссылка ]
RO Membrane and the Remineralizer - [ Ссылка ]
O-ring Silicone Grease - [ Ссылка ]
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