The resin of this DI inline water filter physically changes color as the media gets exhausted. The color of the green resin changes to blue after a few months of use and orange/brown when it needs to be replaced. This DI water filter is 10" X 2.5" and is refillable. 1/4" FNPT The anion resin is a Type I strongly basic gel resin with an indicator dye that changes from green to light brown as the resin exhausts. The change in the color makes it easier to monitor the usage of the DI resin and know when to change it out. Ways to increase the life of your resin: 1. The most crucial part of your RO/DI unit is your RO membrane. It's important to replace the pre-filters (filters before the reverse osmosis membrane) on time and maintain at least 45 PSI water pressure going into the membrane.2. With exposure to the air the DI gets exhausted much faster. Make sure the DI resin is packaged well.3. Flush the membrane every 4-6 months.This protects the membrane and increases the life of the unit by 1- 2 years.
