I just recently had to replace the recirculating pump on my house. When I took off the old one, I noticed what I consider to be a significant amount of scale build-up in the housing. I was surprised by this. The house is only 4 ears old. Is this because of the hot water and the slow flow in the lines? Is this likely developing in all of my lines. Do I need to think about a softener. I was surprised because I am on city water as is everyone around here and I know of nobody with a water softener. Any help would be appreciated.
Thanks
Barry