Last year I had a water leak right by the well casing where there is a hydrant hook up. A fitting ended up snapping after it sprung a pin hole leak. I had to dig down and fix the fitting and replace the well pump as it burnt up during the night pumping wide open. When I dug down the hole filled up with water that I had to pump to work on the fitting. Water was also slowly running out of the well supply line so the water table was really high. I have noticed sometimes my water level in the well is over the top of the pitless adapter. So I got to thinking about pumping power as I am using a 1/2 hp 4" submersible pump that uses about 900 watts running 30-50 psi. With my current bladder tank setup it runs ~30% of the time that the geo is on or avg of 300 watts plus start up surge. (73 secs on 164 secs off). So with the high water level and the water inlet being in the basement I thought the water level in the well might be close to the basement floor level. I ended up getting a circulator pump (Stiebel Eltron CP3S15-62FC) and using it directly off the well line. I seem to be getting about 4 gpm using 95 watts flowing to a bucket. I hooked it up to geo but flow dropped to 1.5 gpm. They used 1/2" line and there is probably 75 ft out to the dump leach field. When I am flowing to the bucket at 4 gpm that equates to ~14 ft of head. Problem is I am just dumping to a bucket so my head is coming from "drawing" the water from the well. I assume this is worse as pumps like to push. My question is if I upgrade to 3/4" line to pass thru the geo and out to the leach field do you think I will still flow close to 4gpm? Will always "drawing" water instead of pushing it wear out the pump faster? I believe my dump point should be lower than the water level in the well so It might also syphon a little if I am lucky. My other problem is I plan to check valve off the pressure tank but if someone uses water in the house while the geo is running and the submersible turns on then I will be flowing a bunch more out the 3/4" line than I do out the 1/2" line now. Any ideas how I can get around that? Here is the test setup. The black line from the top is the supply from the well. The blue line to the left goes to geo.