re: Anyone have experience with well water tanks?

I lived in an older home several years ago and the water pressure was really low. Put in a new pump and tank and still had no pressure so I plumbed the whole house with PVC. The original metal pipes were full of rust. I had a 1 foot length of pipe that I cut out that you could not see daylight through. It was completely full of scale but the water had made a small channel up and down through the pipe where it was not a straight shot through.