The two gents from the West Coast have pretty much nailed it. Heavily dependent on your source water TDS. I ran treated tap water here in Vernon for a couple of years and am glad I finally saw the light & began using RODI. TDS here is over 200. Some of the dissolved solids are good, like calcium & magnesium etc. but most of the rest are just going to build up in your system & cause issues long term.
You should be able to pull some sort of report online from your water supplier that shows the breakdown of TDS in your tap water. This will give you a better idea of what's going into your system if you decide to use treated tap water.
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