I bought a used 1 ton Geo thermal unit that was used by a REC for demonstrations at fairs. I have installed 700 feet of pipe in a slinky in the ground 6 ft deep. I brought the pipes into my garage and would like ideas on how to connect it to the unit. Build a flow center or use a purge cart that I have access to. I'm by no means a expert so try to keep it simple. Thanks for the help

If you have come this far, do the math for friction loss on your piping, calculate for 3gpm at the unit and build a non pressurised flow center out of a container, some plumbing bits, and the indicated circ pump. finished.
Eric

I won't argue with that advice - its a good way to get your feet wet as to geo...oops...bad analogy!

Don't forget anti-freeze if climate warrants