I thought the same thing Jon. There is a lot of iron in some wells in the midwest, but what would that do to white laundry over time? I wonder if 'Washer Magic' would get that off?
The '85 Lady K I worked on a few weeks ago had been on a North Carolina well, but was nowhere near this crudded-up. The supply hoses to and from the triple dispenser valve were completely clogged with minerals from the well, to the point that when I moved one of them I heard the hose crackling.
Hopefully this one is better than that, but iron build-up somewhere, possibly the lint filter, may explain the sporadic drain problem that the owner mentions.