Just want to share.
After some success with my DIY PVC recirculating skimmer w/ SQ2200 pump. I decided to mod my broken down via aqua skimmer sk388 body. I used my Hailea 6530 as a recirculating pump. (My old return pump, w/c was replace by a RIO 10HF)
Both DIY skimmer uses a paddle wheel impeller to chopped the bubbles. Venturi at the intake of the pump.
DIY 4" PVC recirculating skimmer:
After 24hours
DIY modified via aqua sk388 (recirculating)
Intake from overflow, Drilled on the flat/bottom portion instead of the curve portion of the body for better seal.