I'm hoping its just a salt dome thing I don't think so. The water was soft for just a little while after last time it got un-soft. After another couple of regens, still not soft. Water from ground is barely hard anyway.. I think 7 total hardness, based on test strip. Unit is about 7 years old by now. Can/should the resin be rinsed out or re-charged, or something> Not sure what else it could be. Hopefully it'll 'stick' after another regen or two. Thanks.