I work full time on an RV and have had serious hard water problems on the road at some RV parks. This solved the problem. The water hardness has dropped from 425+ to zero. I've only had the device for about four weeks and will be doing my first saline recovery next week and I believe it will cost me less than $1. I bought a smaller block due to the size and weight, knowing I would need to regenerate it more often. Showering is much more comfortable now, my hair isn't tangled and I don't feel any lather when I dry myself. I highly recommend this if you are an RVr.
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