Well, I designed a improved APH about a month ago, and I just thought I might post it. Too bad I haven't been able to get to the Home Depot lately.
Red=Plastic ball valve
Green=Barb
Blue=Check Valve
Yellow=Tubing
Gray=Metal Ball Valve
White=PVC
Quite a simple process. You have 3 very large (3" PVC) PC's. They all have ball valves that can be used to save water, or keep a few PC's pressurized while using the other one (or two). All three can also be used to make an extremely long and powerful shot.