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RE: Phosphates
> <<
> It sounds like you have excess phosphates in your tank, and
> despite the
> insistence of your water treatment reps, I suspect your tap
> water is the
> source. Many municipalities (including mine) ADD phosphate
> to tap water
> because: 1) it is an effective corrosion inhibitor for
> metal pipes, and 2)
> it is also helps prevent the formation of scale. >>
>
> Mark, really? I know of localities using Alum (aluminum
> sulfate) for a few
> purposes... but phosphates? In what format? That is, as what
> compounds?
Really. Check out this this "Water treatment primer" from a civil
engineering class at Virginia Tech:
http://www.ce.vt.edu/enviro2/wtprimer/corrosion/corrosion.html
A good general reference on this topic is:
Tchobanoglous, G. and E. Schroeder. 1985. Water Quality: Characteristics,
modeling, modification. Addison-Wesley Publishing Company, Reading MA.
The form of phoshphorus used is good ole orthophosphate--PO4. Whether is it
phosphoric acid, or trisodium phosphate depends on what pH they are trying
to maintain and which form they choose to handle and store.
Regards,
Mark