Why does BRS recommend this?, We recommend color changing resin for the fact that it will physically change colors as it gets exhausted. That allows
One Cartridge Refill (1.25 lbs.) DI Resin (Color Changing) - BRS
10-Inch Color Changing Mixed Bed Resin Deionization Cartridge –
AQUATICLIFE Mixed Bed Deionization Color-Changing DI Resin Filter Cartridge Refill, 5 Liter : Pet Supplies
Aquatic Life DI Color Changing Mixed Bed Resin Cartridge, Aquarium, Hydroponics : Aquarium Water Changers : Pet Supplies
DI Resin Replacement Deionization Color Changing, TDS, Aquariums, Spot — iFilters
COLOR-CHANGING DEIONIZATION RESIN – The Mixed-Bed Deionization Filter Cartridge contains positively charged Cations and negatively charged Anions. DI
AQUATICLIFE 10-Inch Mixed-Bed Color Changing Deionization Resin Filter, RODI Reverse Osmosis DI Water Filter Replacement Cartridge
AQUATICLIFE Mixed Bed Deionization Color-Changing DI Resin Filter Cartridge Refill, 5 Liter : Pet Supplies
6 Stage Elementary 150 GPD RO/DI Water Filter System – LiquaGen Water
AQUATICLIFE Mixed Bed Deionization Color-Changing DI Resin Filter Cartridge Refill, 5 Liter : Pet Supplies
4 Stage Reverse Osmosis/Deionization (RO/DI) Portable Space Saver Wate – LiquaGen Water