yes, each of the 5' 4inch pvc's have 5 bubblers inside them. so 25 bubblers. 1 under each of the pots, water is very airated then once a day new water is pumped up from the resevoir reciculating the water, the resevour also contains 2 bubble wands and a pump just to keep the water moving 24 hours a day. plants are getting big about 3 foot tall each overhead i have 2 400 watt hps with cool tubes and 2 200 cpm inline fans pushing the air through the tubes and out the roof...are you suggesting that i keep the water pump on all the time recirculating from the tubes to the res constantly? i figuered with all the air stones once a day was plenty. I have a bloombox from bc northern lights, and that is dwc. So my set up is kind of a cross isnt it? its working very well so far but dwc or ebb n flow? Also like i said the roots of each plant are huge beautifully white colored, water is definately not stagnent and i check the ph daily and keep it between 5.5 and 6.2. I change the resevoir with fresh water and general hydroponics nova series pluss koolbloom and mad farmer N.U.T.S EVERY WEEK.The last 2 weeks of flower i just use ph balanced water plus g.h. kleen and at 8 weeks the leaves are yellowing so i know all the nutrients are gone. right now i have 6 critical hog, 11 northern lights and 8 blue mystic.s in there.