overflow box - c syphon

[Pescador]

If the pump is too much you can put a valve on the output side of the pump (never the input) to throttle it back to balance the overflow.

[whitsunday]

syphon had broke causing problems.............sucked out air again ........syphon working like crazy..............lots of gurgling and sucking...easily keeps up to pump.................now needs a valve on main output of syphon to quiet it down..............yahoo!!!!!!!.........progress