Carbon Block Filter (OMB934-5m) - Replace every 6-12 months
Reverse Osmosis Systems
Watts F500398 3-Stage RO Replacement Filters
This Watts 3-stage system, model F500398, is a traditional RO unit with innovative half-turn filter housings. The system is designed for undersink use and has industry standard cartridges. See below for all replacement filters and parts.
Replacement Filter Info
RO Membrane TFC 50 GPD (
Helpful Filter Information
Not all filters have the same replacement schedule. Replace the RO membrane filter every two years. Replace all other filters every 6-12 months. Help keep your system sanitary by never using filters longer than 12 months, except the RO membrane filter, regardless of how much water you use.
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