Reverse Osmosis Systems

Watts 315 3-Stage RO Replacement Filters

This is a traditional, 3-stage reverse osmosis system for undersink use. Be sure to replace the carbon pre-filters at least once annually and the RO membrane every 2-3 years. These parts as well as the replacement tank and maintenance kits can be found below.

Replacement Filter Info

Carbon Block Pre-Filter (OMB934-5m) - Replace every 6-12 months

RO Membrane TFC 50 GPD (555694-00) – Replace every 24 months

Carbon Block Post-Filter (OMB934-5m) – Replace every 6-12 months

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.

Manuals & Instructions