1. I don't think so? (maybe)
4. Tie that in too with a tee...shouldn't be a problem as I'd just be adding a suction and a return line to an existing pump.
Another option could be for me to replace the low flow circ pump with a high flow circ pump. What does a high flow circ pump need as far as diameter tubing, number of return jets, return lines, number of suction lines?
I'm not even sure that's possible....