To answer your question, One air stone per bucket is what most folks seem to do.

If and when I make the step up to hydro I plan to do it right. If I home build this type of under current DWC system I'd save about $750! All those individual buckets seems like allot of heavy lifting, IMHO.

[YOUTUBE]4e8mK19mcPM[/YOUTUBE]
Ocotillo Reviewed by Ocotillo on . DWC i am building a 40 bucket dwc system my question is do i put a air stone in each bucket or just a air line(no stone), cause a buddy of mine told me that the air stone will kill all the bacteria(and you will want some bacteria) and recommended me to just put a 8in round air stone disc in the 55gal reservoir and it will be fine Rating: 5