I just went back out there and the pump kicked in. The gauge is at 50. The well guy thinks our pump is going out but I can't afford for it to go out right now. Whew!
I'll buy some bottled water and not do laundry for a few days. Thank you all so much for your help!
If it causes any staining, go to Home Depot and buy a small container of Iron Out. It's white, with red cap and label. It really works well, just be careful, it's pretty nasty stuff.
I worked for a well company, we used it, and customers noticed near-instant results. It worked on my rust-stained t-shirts, too, when nothing else would.
What are the symptoms that make them think the pump is failing? Usually they either work or don't. BTW looking at the picture you posted those kind of tanks can get water logged making the pump cycle frequently and a loss of pressure. The water BTW should be safe to drink.