Purdy,

Just a few questions to fill out the scope for us all. Do you know what flow rate the emitters will work at per your system operating pressure? What size(gallons) is your collection basin? I would not integrate with your HVAC system except to have condensation water go to the basin collection tank. Keep the recirculation and irrigation pumps separate. The irrigation could be smaller if placed at the upper part of your system. The recirculation pump in the collection basin at the bottom. Install a water elevation float valve in your collection basin to regulate the inlet water to replace the water your plants transpire above the amount your condensate line contributes. JMHO Aloha

The emitters that I have seen are between 0.5-2.0gph. Multiply that by 15 of them, then we're looking at around the 0.5gpm that the pump will require. However, if there was some emitter (or just a way to make an emitter) that could operate at low pressures, then the flow rate really doesn't matter; I'm just looking to keep the roots damp.

The only way that the Bio-wall is integrated with the HVAC system in that the return air will run through the plants to filter the air (VOC's, formaldehyde, etc.). No condensate lines will run into the irrigation water.

The basin will collect the water that runs all the way through the growth medium and will be recirculated to the top of the Bio-wall to irrigate again, therefore the size of the basin will not matter.

Thanks for your guys' help.

P,

I don't know what for but your welcome. Aloha