The Show Stopper!

Recently half of our flow (the south side) went from 400 gpm to 60 gpm. We were in a bit of panic, trying to figure out what was wrong with our dewatering pumps. We even rewired the entire south side pumps at which point in time I learned a ton about circuits and breaker boxes. After two weeks we made a couple crucial discoveries. The first was that one pump was burnt out but the rest were fine. The other was that a small rock had gotten stuck in the mazy, a part of the system that sucks in air. As soon as the rock was taken out, the flow rate shot back up! The rock is shown on top of a mazy. On one side we wrote "The Show Stopper" and the other side says "The Party Stopper" in spanish. The rock is stained orange from the oxidized iron in the water.