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I personally do not own a pH controller, as I do not think it is necessary, even with the injection of CO2.

Some people like using them, while others think they are unnecessary :)
 

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I think the better question is, when does it give you a better advantage to invest in one. I have been thinking of purchasing one for a while now as well but it seems more of a want than a need for me unlike when I joined pressurized side of co2.
 
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