I have a very hard time noticing a difference when they get old. My zeolites right now are so far past overdue for replacement it's not even funny.
I think I notice my water is clearer the first few days after a zeolite changeout though. It's not so much the water seems clearer, but the lights seem brighter, which I attribute to the water being clearer.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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