pop-ups

Hello all. The venturi style pop-ups in my 35,000-gallon plaster pool have not been rotating at all since last summer. I have checked several pop-ups in the spa and 2 shallowest zones regularly during an 8-hour cleaning period. The water spray remains in the same direction. Debris constantly...

I have an A&A mfg low profile 6 port valve. When I run the pump on a low speed all the pop-ups rotate as they should and I can see the paddle wheel spinning, though I don't think they pop-up as much as they should. When I run the pump on a higher speed, I think the paddle wheel is spinning (hard...