Originally Posted by Speedbump
Get rid of the check valve alltogether and that piece of junk inline filter.
The above may get rid of your hammer and it may also give you an indication of what the real problem is which that above ground check valve can be masking.
What is that gadget on the wall supposed to do?
If no check valve, where would I attach my pressure switch so the pump knows when to run?
What is your reason for not having a check valve here?
If I eliminated the junk inline filter, how do filter out sediment?
The gadget on the wall is something I would assume you would reckognize??? Maybe? It's an ultraviolet lamp filtration system.