also, I found that I can equal out the pressure to close to 0 by adjusting the size of the intake. so that the water is siphoning in at the same rate the pump is pumping it out. if I make the intake siphon slower by restricting it, it will cause a negative pressure in the filter because the pump is trying to suck water through it quicker than it will naturally siphon. if the intake is to big, there will be a positive pressure because the water wants to flow in faster than the pump can pump it out. does this make sense?
