No pressure on gauge

[Serling]

I opened today and did all the usual things to get ready to slam, this is my 4th opening in as many years.
I cannot drain any water. I've checked all the fitting, checked the main drain and basket,taken the plugs out of the returns and nothing.
I've primed the pump and checked the gasket around the washbox. Any ideas for any of you fine people? The gauge reads ) and no water coming out of the returns.

 

[Serling]

Also I have tried every setting on the filter head. Thanks

 

[mknauss]

Can you update your signature with the type of filter you have. Sand, DE, cartridge, etc

 

[Serling]

I just updated signature, thank you.
Sand filter