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Re: [APD] pH control

I believe Jerry Baker wrote this email section below:
> 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.

Is Sodium hydroxide corrosive to metal?

This is easier to get in the shops as Caustic Soda.
Though I guess there may be issues with possible soap contamination?

Stuart Halliday
200 Million years in the making...
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