I have to ask... What is electroflotation?

Sounds interesting.

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Brad Hernlem
> Sent: Thursday, June 13, 2002 10:21 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: pool ionizer
>
>
> s.hutch@mindspring.com asks:
>
> >Has anyone have any insight on using a PIC to control a set of
> >electrodes
> >(copper,silver) used for swimming pool sanitation? The >marketed versions
> >of these "mineral ionizers" are expensive for what >they really
> need to do.
> >You are paying for fancy packaging of a basic >circuit. The DC current
> >polarity reverses every so often ( I do not >know the time interval) and
> >the current is limited to regulate the >rate at which the ions
> are  "worn"
> >off of the electrodes. I do not >know the quantization on this either. I
> >was going to purchase a >replacement electrode ( <$100) and design a
> >conroller if I could find >more info on the physics of the ionization. I
> >figured I would check >piclist to see if anyone has already visited this
> >area for a PIC >project.
>
> >hutch
>
> Hutch,
>
> Most such electrolysis electrode packs are NOT made of copper or
> silver but
> of oxide coated titanium or niobium (columbium) electrodes. The oxide
> coating is generally ruthenium oxide where the objective is to generate
> chlorine. This type of electrode is also known as DSA (R), aka
> "Dimensionally Stable Anode". Copper or silver, when used as an anode will
> erode, shedding copper and silver ions into solution. The coated titanium
> electrodes will not do this. The purpose of polarity reversal is
> merely for
> scale reduction. It will not prevent the eventual destruction of copper or
> silver electrodes. I would think that you could achieve the polarity
> reversals just as well either manually or with a mechanical timer switch.
>
> I use such electrode packs in my research on electroflotation. I would be
> happy to answer any questions that you might have concerning
> these electrode
> materials.
>
> Regards,
>
> Brad Hernlem
>
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