The anion component is infused with a permanent pH indicator dye that changes color from blue to amber as the resin exhausts

The Commercial RO has three 20-inch pre-filters (a 10 Micron sediment

When the blue tank is full

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20" DI Cartridge Refillable MiscROSystemParts The anion component is infused20" Refillable Cartridge Clear Twenty inch re fillable cartridge. Filter filled with non color changing DI resin. Resin is a mixed bed 50% Anion and 50% Cation DI resin. Used in car wash spot free and zero TDS applications. Excellent for fish and aquarium stores. Shown with a ten inch filter for size comparison. Add this DI filter and a 20 inch slim line filter housing to our commercial pump driven RO system for awesome top off water OR if you want to