so, we have some very active chipmunks/mice in our area and this year, they burrowed a huge hole inbetween our diving rocks and displaced over 5 gallons of sand. I thought we got it all, until i realized that a lot of it has fallen into our pool.. my husband was vaccumming it up and our pressure dropped to 0. we then realized it was sand and starting filtering to waste, but now the multi-port valve is stuck.. we're trying to open the valve to unclog it b/c it's clogged with sand, but according to the directions (hayward SP0715 multi-port valve), it has to be in the filter position, but we can't move it from the waste position. there's also sand in the DE filter, since i can see sand in the backwash viewer.
any thoughts on how to fix this? and how much damage has been done?