I had a somewhat similar issue with an aquatic life unit (similar to the mighty mite, which I owned several years ago). My color changing resin was depleting/changing color waaaayyyy faster than I imagined. It was halfway "depleted" and I've ran less than ~200 gallons through it at ~30 gallons at a time. I was wondering if there is such a thing as too much water pressure? My waste water was flowing like a pressure washer. -A-a-ron