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Re: [APD] pH control

I believe Robert T. Ricketts wrote this email section below:
> Stuart Halliday wrote, in part:
>> Surely RO is pH 7 and adding a buffer will only raise the pH again?
> Nope, if the RO is run under a N2 atmosphere, it will be collected at close
> to pH 7, but soon after exposure to air (with CO2) it will decline markedly
> on the acidic side.  If the RO is run high rejection and produces product
> with undetectable (by hobby test kits) KH (carbonates and bicarbonates), it
> will be closer to pH 6 than 7.  Any organic acids (inevitable in tanks with
> any bioload present) and it will drop lower quickly.

Well no one mentioned the real-world effects of the atmosphere! :-))

A RO unit will move water pH towards 7 but of course containments will move 
it away again. But then the water isn't pure any longer... ;-)

Stuart Halliday
200 Million years in the making...
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