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

[Poconos]

Sounds like the filter tank has a lot of trapped air that is under pressure. A large volume of pressurized air will cause the geyser effect. Filters should eventually purge themselves of air by some mechanism. Not familiar with DE filters but is there an air relief valve or anything that might resemble one on the top somewhere? If you find something try opening it a little while the pump is running until water comes out. Best guess for now.
Al

[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.??