I forgot to say- my pump will be no more than 2 feet below the system, if that helps. And i was going to have the pvc pipe in a rectangle shape, now should I cap off the end , or have it connect back?

Hey there, the way I see it the pump is only pumping about 200 Gallons Per Hour and therefore won't have much in the way of preassure. I'm new to this as well and in the process of building close to the same system as you just a bit different layout. I ended up buying a 1/6 HP sump pump for $90 at the garden store. I will be running solution through 1/2 tube and feeding about 28 misters. Worst case I will take out the misters and let the 1/8 inch holes spray solution on the pots and root wads.

Phil in Alaska

well, I know the diaphram pump pushes 50 psi at 3.3gpm, and my nozzles need 45-1000psi to work, I guess? So I figured it might work. The nozzles only put out like 0.010gpm.

Well that sounds like better math than what I was thinking. Would you let me know what the outcome is, I'm in the same boat as you right now and will be curious to hear how it does.

Phil in Alaska

You should spend some time studying fluid mechanics and pump characteristics....the emitter requires 58' of head to work at all and that's a huge pressure drop for conventional pumps thet will be delivering the low volume required by your hydro set-up.

From your post, you will need a 3-5 gpm pump at 60' of head (25 psi) and I have never seen commercially available pumps that operate in this range.