Water is very hard in this part of Texas. I have a kinetico water softener and an electric tankless water heater. There have been a couple times when the Kinetico was not working, my fault, not the units. Anyway, When the softener was not working there were white "things", kind of like plastic, that were clogging the screens on the faucets. Figured out it was when I used hot water. I called the manufacturer and was told that the heating elements had a coating on them that reacted with the minerals in the water when they got hot. Said they were cheap heating elements that the original manufacturer had used. Was also told that I MUST use a water softener with the tankless.
I bought 2 new heating elements and tested them by bypassing the Kinetico. The faucets did not clog up.
Moral of the story. Use a water softener and make sure heating elements are not cheap.
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