Sand Shooting in through Jets! Help!

Jun 16, 2014
1
Channahon,il
I have a Sta-rite crystal flo high rate sand filter and it's always worked beautifully. I know I broke it, 100% my fault, wondering what I need to do to fix it. I moved the handle from backwash to Waste without shutting it off. While doing so there was a very loud thud. I turned it off and started the filter because I assumed something broke and sure enough sand is coming out the jets, a lot of sand. I need advice on how to fix it quick.

I'm having my boys (twin 7 yr olds) baseball team party Sat. and don't want to disappoint them. Thank you for any advice!
 
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