Sweet. Yeah the key to a good surge will be the larger pipe diameter the better. I'd love to see real "crashing surge."
Have you ever heard of a Carlson surge using 4" diameter pipe? I bet it wouldn't be practical. I'm thinking the actuated valve would be the only way to go. A MOV for 4" PVC gonna be pretty costly though.

Mind you, you only buy it once, so .... hmmmmmmmmmmmm I think I know what my NEXT project will be AFTER the next tank is built
