Sorry for the delay been out of town this week.Lets start with ugmjfarmer and work down.You can use vinyl I use pvc as its cheaper stronger and easier to get.I wouldnt use any kind of spinner misters as the roots will hang on them and stop the spinning and block the watering so they dont work well at all.I reccomend a 20 gallon tub for just 4 plants not really any smaller as the roots will fill it quickly and the amount of water plays into how often you have to ph or adjust your ppm. Less water more ph and ppm jumps as plants drink .
Next onto Chowder Heads questions..This system works from start to finish.As with all tub setups you fit the plant size to the space.A 6 plant unit in like a 30-35 gallon res you want to use lollipopping techs and go to flower quickly so plants stay small and you get main colas.I highly reccomend using rooted clones as they can go right to flower when rooted then placed in the setup so you can finish with around8-10 inch plants that you lollipopped and go for like 1-2 main colas from each plant.A 20 gallon tub can do 4 smaller plants all the way through but bigger is much better as the roots will fill the units fast if correct ppm and ph are monitored.Question 3 is a little unclear if you veg and flower you need completely different lights and light times meaning your flower tub will be in 12 hours of uninterupted dark while the veg tub will be on 24 hours of light or 18 if thats what you like.The veg will use your blue mh lighting while the flower will be under hps red/orange lighting so you can have in same room but have to be completely seperated so lights dont bother the 12 hours dark of the flowering unit. These can go anywhere you have room they work well in closets.Now for clones I like to just use my humidity dome and rockwool cubes til the roots form through the cubes then toss them into the aero unit. You can make an aero cloner if you want but to be honest a good cheap humidity dome and rockwool is the best way to go.Last question on this about setup.Im not currently using any tubs as I use a 32 site larger post setup I showed in my journels and then I use 2 4x8 tents with flood tables and 1 4x4 tent with flood tables. I probably will do a 4x8 tent with 5 of these units in it some time soon though so check my grow journels for that in maybe 3-4 months when I have free time to setup a new site.My lights are hung from the tent hanging mounts.The larger aerosetup I have a 8 foots light mover rail with a tandem carrier holding 2 600 watt lioghts that moves back and forth on the rail bolted directly to the cieling.Light yoy yo hangers work well for a tub unit in a closet or area they let you use 2 hooks on the cileing then they have a retractable cords to raise and lower the light to desired hieght,,,And last to Proph question.I like the misters in tubs and my larger post setups but I like the pop up sprinklers in single plant 5 gallon bucket setups or for aero cloner buckets. Hope this helps out..