The Pro+Aqua Med-Di-3/2 Offers 6 Liters (2 X 3 Liter Bags) Of Mixed Bed Deionization (Di) Resin Media And Is Ideal For Aquariums As Well As A Spot-Free Rinse For Your Car Wash Or For Your Windows (Home Or Business).The Pro+Aqua Mixed Bed Deionization Di Resin Media Is A Mixture Of Premium Grade Color-Changing Strong Acid Cation In Hydrogen Form And Strong Base Anion Exchange Resins In Hydroxide Form In A 1:1 Volumetric Ratio. These Resins Combine High Capacity With Superb Physical Properties To Provide 99.99% Pure H20 Water For Ultimate Tds Purity.

The Color-Changing Mixed Bed Deionization (Di) Resin Media Makes It Easy To Tell When It's Time To Change The Resin. The Resin Media Changes In Three Stages

• Stage 1) Full Capacity - Original Dark Green
• Stage 2) Half Capacity - Light Amber
• Stage 3) No Capacity - Dark Amber/Orange. Achieve 100% Tds Reduction When Used As A Post Filter In Reverse Osmosis Di Systems. To Ensure You Continue To Produce Tds-Free Water, It Is Recommended To Change The Resin Before The Resin Changes To Dark Amber/Orange. Fill Capacity: Fills 9, 2.5''X10'' Drop-In Cartridges. Fills 21, 2''X10'' Inline Cartridges. This Is Not Water Softening Resin, This Mixed Bed Deionization Resin Is Designed To Lower Tds And Is Not Designed To Lower Water Hardness.