the two close loop pumps (each rated 1535gph @ 4' w/ 1" pipe...I'm running 2" feeds/1.5" returns

), all the pipe, one of the 2" "screens" that feed to the one of the closed loop pumps (there is an identical "setup" on the other side of the tank), and two of the closed loop returns....
the system is setup so the feeds and returns are different sides, ie: left feed tied to right side return, right feed tied to left side return....this way:
a. if a pump goes out, no one side looses total "movement".....
b. I ENSURE water movement from one side of the tank to the other.....
the funny thing is, those 2" screens don't seem to be able to keep up.....I ran the pumps this evening and found that I basicly had a "surge" system as the water could not fill the pipes fast enough (with the screens on) to keep up with the pumps.....the pumps would empty out the 2" pipes, "stall" (still run but no water to pump), the pipe would refill, and the pumps would empty the pipe out again.....almost seemed like the perfect "wave" action if it wouldn't hurt the pumps (which I'm not about to risk).....I'll drill some holes in the screen tomorrow....lol