Only picture I've got that roughly shows the system, and it was modified a lot since I took this... But you'll get the general idea...
After this shot was taken, I used 3/4" pvc to connect the two different legs (evens out the flow), and added a couple reducing tees to 3/4" pvc for some additional jets and I drilled a few 1/4" holes to provide some more circulation in behind the rockwork. Seems to work very well, at least I like it...
