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Re: [APD] pH control
> Pump water through a chamber with some sea shell powder
> or other lightly soluble alkaline substance and switch the
> pump on/off with the pH controller.
I would think the best way to go about this would be a dosing pump and a
strong alkaline solution of KOH or similar. Just use the pH controller
to turn the on the spigot for the alkaline solution. The only potential
problem I see is the corrosive nature of KOH or NaOH on the valve.
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