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That is not how I would do it.
What you're doing here is trying to shove water into the DI system. Presumably, you have a similar y on the other end so there's nowhere for it to go directly out, so it's just all mixing around inside. So you're using up resin and not getting anything out of it of benefit.
If you added a shutoff valve between the Y and the DI system, it would work, you would never close the house side of the y, and close the shutoff at the Din and open the bypass portion of the Y to bypass it. I would duplicate the setup on the output side to
Just my take, I'm no plumber or hydraulic engineer.
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