what size net pots

if im doing a sog can i use 3" net pots or do I need 6"? does anyone use 3" net pots

What method are you using? I have run 2.5" in aero with no problems

dwc maybe 6-8 plants per 70 gallon tub

screw the tubs grow in 5 gallon buckets giving each plant more space to grow.

ya i already thought of that but with 30-40 going that will be a lot of pumps/lines/stones. tubs are more cost effective and with buckets then i have to change all that water individually and that will take more time. Buckets also take up to much space for a sog.