This is the inside of the index valve from the clogged well I worked on last week. The owner had me come back today and replace 13 rotors and fix all the other breaks-after testing the system several times, the system got stuck on one zone-so I opened up the valve and found this lovely mess. Got my wire brush/bucket of water out and did a little house cleaning. Dropped in a new stem and disc, tightened the screws, and it worked flawlessly. Boy, if that is what the well point looked before the acid, no wonder it had very little flow.