Swimming pools blog

I have a 20X40X4 inground vinyl pool with a Haward sand pump.
Yesterday I was draining the water out on ‘waste’. Then, after I took
it through it’s cycle of backwash and rinse I turned it on ‘filter’.
Only bubbles came out. I turned it off and left it overnight. I went
out this morning. Nada. Nothing. The pump sounds makes sounds but it
isn’t working on any of the settings. What is the problem?
MB