Color Indicator DI Water filter Cartridges is great for aquariums, laboratory testing, and other applications where ultra-pure water is necessary.Mixed Bed DI Color Changing Filter In Clear Housing.The anion resin is a Type I strongly basic gel resin with an indicator dye that changes from blue to green as the resin exhausts. 

Details:

1. Color-changing deionzation filter cartridge;

2.Refillable & reusable filter cartridge,save on refills and buy just the media;

3.Clear cartridge allows easy detection when color-changing mixed bed resin is exhausted.

4.Change color from dark blue to green and from green to yellow as resins exhaust;

5.10"/20" standard size clear cartridge,fits all standard 10"/20" conister housings.

6.Remove the remaining total dissolved solids (TDS) from membrane-filtered water