8 waterfarms would require a large airpump that can cope with 8 airstones, I use a 90L/Hour piston pump for my 6 URDWC 20L pots and that works fine. I would also suggest using the 2" round ball airstones as they produce maximum amount of bubbles for the airstone unlike disc airstones which only use partial airstone. A manifold will be fine. The dripper system on the water farm doesn't use much power, a small single outlet airpump will run 1 waterfarm, however again I would use a manifold on the 8 covering all of them.
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