I just installed a new softener with brand new resin out of the bag(s). It's in service and we're not really noticing any difference. I realize the hot water heater has a supply of hard water in it still, but I think we've flushed that by now. The unit has not regenerated yet though, does the resin work right out of the bag? My other thought is that since this house has been doing its thing with no softener for about 30 years, there may be a lot of mineral build-up in the pipes and water heater. Is it possible that we'll have to wait for that stuff to clean out a little before we see full effect?