I'm not a regular on this forum, but I have seen that you enjoy good country living, so I wonder if you might be familiar with red water in nature.
When I first read about it, I thought it was confined to the Artic, but it's not, and it seems to have been happening only in the last two years (and the media doesn't seem to want to address it).
My first post about it was on the "Test forum" because I didn't know what to make out of it, but now it seems that it will sporead. Have you ever experienced something like this?