Ya, been doing the hpa/tag for awhile, had to cheat a lilbit due to the grocery store pressures being much higher with higher flow rates. I was getting good results with 3'x3' per plant, although still having to deal with a lil saturation. I'm not sure what you mean about john guest, I use there fittings, but have used test pumps on lpa/accumulator setups for awhile, using dual 12v deep cycles as you said. I use the 6800 for cloning, and another for veg. Have to say this thread was/is pretty good, didn't know the difference between all the nozzle being that I was using a high pressure stainless steel system. This build is kinda a tester, LOL. Not sure if I like having more than 1 plant per pod, but I'lil be running a nice high yielding indica a buddy in Cali sent me called starfighter. Its alien chem x alien og. Have been really interested in your as thread. Don't check out forums much, so I haven't heard much about it, way cool. And for chamber size, I learned this by throwing my HP misting system in 5x5 PVC, and at crops end the couple plants furthest from the Mister were taking over the chamber, and had nicer roots, (not fuzzy, but not nft). So after that I started building my own chambers.