I aim for 6.7 and adjust the flowrate of the effluent if the levels don't maintain (ie. increase flow and then adjust CO2 so that pH stays at 6.7). So you sound on the right track to me, but may need to increase flowrate.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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