So I tried plumbing 12 plants in a row with one pump. Didn't work to well, so I'm keeping it to one pump per 6 plants. Each plant has a single hydro-halo in it. 3/4" main tubing, 1/2" to the hydrohalo watering ring. Anyway, I'm wondering what is the best way to plumb it? Top or bottom illustration for best pressure consistency to all rings? Or maybe scrap it all for ball valves? I'll probably use ball valves at each ring anyway to control flow to them. Any new ideas appreciated too! Thanks-Mac dizzle