Indicator-Resin is a mixed-bed resin for removing silicate, nitrate, and other ions from reverse osmosis water. The special silicate resin helps limit diatom growth, particularly in aquariums.
The resin is equipped with a color indicator that displays the efficiency of the filter material. When the conductivity of the desalinated reverse osmosis water begins to increase again, the resin changes from blue to green and must be replaced.

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