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DIY CO2 controller

Pardon me if this is a very dumb idea
but I am wondering if anybody has tried
to make a rudimentary CO2 controller
using some sort of battery immersed in
the tank. The tank water could maybe act
as an electrolyte and the anode and
cathode could perhaps be carbon and
zinc. Would the such a battery only
produce current when the ph dropped
below 7?

Wayne Jones

Wayne's DIY Aquarium Setup at