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another way to do it is convert a fuel tank float(get a new one of coarse) and use that as the switch for your water pump to pump water from the 2 resiviors to the main res....but you would have to be careful about having electricity so close to the water...most are submersible though.

Yes I was thinking the same thing about the gravity fed idea. what kind of setup are you using? I have made a mixture or aero and dwc... I used a 30 gallon rubbermaid and cut 10 holes for 3inch net pots, installed a homeade sprayer with 16 nozzles adn about 6 air stones and a long air bubbler. I...

Why don't you just use an eb and flow float and switch to setup the res.? I would think that would suffice. You would use the float in the growing res and then when the float goes too low the switch kicks in and turns the water pump on to deliver more water into the grow res...