Just a simple drain to waste using the fertigation manager basic kit on an 8 hr cycle to feed plants then drains into drip trays which goes to the pvc and into the bucket/pump combo and the black line pumps the runoff to a measured 5 gal bucket so I can have a rough idea of how much is produced.Been looking at your system and I can't figure it out. What is the return lines and the bucket with a pump in it for? Was it a drain to recirc system?