Original closed loop plumbing in white PVC.

Plumbing setup for 60 gallon Flat Back hex

Same closed loop plumbing After Painting with plastic spray paint all black! Like the look? I did! I dry fitted the PVC and then marked where the fittings went, and painted it THEN GLUGED IT place. I had to modify this design I will have updated pictures shortly, Right now im just using the lower 1” PVC on each side where flow is critical.

Closed Loop return Right side, locline with nozzle.

Closed Loop return Right side from side, And left side from front.

Auto Fill DIY Venturi  fitting, screwed into return pump, this is used for auto filingl sump with fresh RO automatically ( constant running pump with drip of venturi pulled in, amount controlled by needle valve) Instead of air induction, this will pull water into the tank system from external containter (5 gallon jug). Could also be split to pull in other liquids at the same time. Venturi does not restrict pump flow as it is a slight concave on the inside of the fitting

Auto topoff MOD using camping pump and Uniseal for easy filling. Here is the link on RC for this mod..   I added the ABS pipe and fitting to this idea to fill the Jug without removing the pump.

Drawing of Closed loop intake current version on tank. Using 1” PVC

Drawing of Upgrade Closed loop intake Using 1.5” Intake and ABS

Photo of Upgrade: Closed loop intake Using 1.5” Intake and ABS reduced down to 1” PVC and Hose barb to pump housing.

Closed Loop Intake Version 2.. first version above LEAKED!