Water hammer from my check valve

[ScubaSteve]

To avoid hammering you want to avoid shutting off the water quickly. This could be as simple as putting a ball valve after your pump (never before!) and close it slowly before shutting off your pump. But you probably don't feel like this hassle...

You can also decrease the degree of hammering by limiting the straight pipe length before and after the valve. You can further disrupt the hammer effect by adding an elbow; this disrupts the propagation of pressure waves through water.

Yay Science!

[ReefJunkie]

Thanks for the advice Steve, I tried both of the solutions to no avail.
I did install a ball valve after the check valve (was going to anyway to adjust flow) and I also installed a 90 after the check valve but it did not affect it at all. The ball valve works but does not help for unexpected power outages or pump failure. Any other suggestions? Anyone? What type of check valves do others use?