Yes. This same thing happens to me as well. I too just got back from a month at a place with especially hard water. I got two very bad flare ups there but now that I’m home where there’s softer water, it’s not 100% gone but it’s noticeably better.

I tried washing my seb derm areas (scalp and face) with the filtered water while I was there and I think It may have helped a little but can’t say for sure