Here are my submerged in feed pipes to my grow beds, they have a 4mm air hose line to create a venturi type bubble system into the ST. they also help stop the syphons from blocking.




To the left the relief pressure ball valve. And left off that a tee piece that goes from 20mm pipe from the pump to a 25mm tee. 25mm to the fish tank controlled by another ball valve. And 25mm/15mm pipe reducer going to the Grow beds. I can adjust my water flow to suit my needs. Go from FD to CF.