If you haven't regenerated it on a timely basis the resin could be going bad. Or if there is a high level of chlorine in the water, that will cause resin to go bad.
If you put it into a regeneration, in the backwash position, is there a strong flow to drain over some time (7-8 minutes), or does the flow slow down or stop in that length of time? If it slows then I suggest the resin is bad,







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