Help with diy uc dwc progect.

I want to experiment with UC DWC and want to build my own system so i would understand the system more. Ill be "renting" space in a buddys grow sence mines pritty full at the moment. I want to run in a 5x5 tent so my plants would be less affected by his lights. I plan on running 5gal square pails http://www.containerandpackaging.com...asp?item=P105P.
in a 3x3 patern with 18'' between pails and 12'' between pails and tent walls.
I just have a coupple questions.

1. what size pvc to conect the buckets i was thinking 2''. Also i saw angled cuts in the pvc in some set ups Whats the purpose of if any.

2. should i use one or two return pumps. And what gph should i use.

3. do the size of the net pots matter or should i use the largest i can fit in the lids.

Thats all i can think of right now thanks for looking and any help you guys have.

2" should be fine if you're not growing some ridiculous trees. I've heard some say
that the angled cut was to help create a swirl effect in the buckets but I made my
cut straight so I don't have any experiences.

I would use two pumps in a 3x3 setup to pull from the two points between the back
buckets.

I don't think the net pots matter, I chose a bigger one to help with the stability of the
plants.

thanks for your input im going to check out your diy and if i have any more ? ill just ask you there thanks agen

hi dont know if you know but check out www.cch2o.com if thats the system your building i have built one my self but using 5 gallon/20 litre buckets light proofed an i used 1 1/2" pvc pipe i run a 500gph water pump with 55 litre a min air pump i have 2 6" airstones in each bucket an so far it seems pretty impressive water flow is constant i am really proud an built for a fraction of the price they sell the 4 pod system also i could not get the ez stor pail/bucket they use but if you live in the usa this will not be a problem for you one thing i have done though on the pvc pipe that attaches to water pump i have put a filter screen to catch broken roots etc hope it helps great little system peace

yea i have all the plans figures out i just need to gather parts thanks for the help