The drinking water should not and does not go through DI in the diagram above. That 6th stage is a carbon drinking water post filter.
The fast high pressure flow from the storage tank is not good for DI life.
Dual DI with color change is nice. Once DI #2 starts to change color, move it to DI #1 and put in a new DI #2. This way you are always getting the max life out of your DI and never have an expired DI.
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- Scott
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