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I was thinking the same thing about the DI container, do you have the resin that changes color when its spent? Mine goes from blue to that brownish color, when its completely brown I change it but it seems to change color vertically. Typically my input to the DI is between 1-5ppm.
I run a T between my RO and DI, it goes to a 3G storage tank under the sink for drinking water.
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Check out my reef tank upgrade project by clicking on the red house.
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