Hey bro its all good im glad that your interested in hydro. i have run soil awhile myself then the past few runs i have switched to hydro and i have to say once you get the hang of it you will love it. not as messy i think with no dirt ya know. well recirculationg DWC works in the way that i have a 20 gal resi that gets cleaned one a week and a fresh batch of nutes too. since i have only have 2 buckets in my system i use a dura h2o pump that pushes 138gph and it would prob be good for 2-3 more buckets i bet. yes the pump in my resi is always on so it keeps that water moving with out getting stagnet. and to answer your last question yes, the water is pump out of the resi into the 2 buckets where there is a 4in air in the bottom of each bucket and then the water is drained back to the resi, just make sure your buckets sit higher than the resi of the water will not drain back and you will have floods all the time. and its all good dude, that what this place is for to share knowledge, i had to ask those same questions when i was starting. good luck with every you do buddy.
RD:pimp: