Watts 315 Three-Stage RO System
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
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.