Re: [APD] pH control

[Jerry Baker <jerry at bakerweb_biz>]

Raj wrote:
> 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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