PVC aeroponics tube system

hi i want to build a pvc aeroponics tube system all the plans that i have found they are made with 6 inch pvc. i was wondering if it will work the same with 4 inch pvc, 6 inch around here is $60 for 12 feet and 4 inch is $12 for 12 feet . what do you think ? thanks

Check out this thread https://www.rollitup.org/hydroponics-aeroponics/116859-harvest-pound-every-three-weeks.html

Should answer any questions you have.