DE Filter creates geiser thru skimmer when turned off q's

[rio002]

There is an air release valve at the top, and I open it when the tank is refilling to let the air out but I'll try opening it before shutting it off and see if that helps. LOL the last geiser sent my skimmer basket flying into the air and it landed dead center of the pool, that was fun to find as the pool isn't cleared up yet

[rio002]

Alright I was just outthere, and opened the valve for a minute before shutting it off, but it still did the geiser thing. Still wondering what's causing it.??