RE: Soft water Cu sub chronic toxicity RE: Cu/Zn dechlorination was: Recycling activated charcoal

["David Lains" <david at zfin_org>]

Hi Lee

><{{{>So, if I understand it, without the carbon filtration the
><{{{>fish would have
><{{{>died from chlorine. How was the chlorine removed in the main
><{{{>fish room?

Yes the fish would die if exposed to chlorinated water, they are not.  The
main room is RO water salted to 500 microS with a salt mix of Ca Mg K Na
chloride salts.  The carbonate hardness is maintained by aragonite added to
the fluidized sand bed.

><{{{>With carbon filtration they were chronically ill from carbon
><{{{>induced chloride cell
><{{{>damage linked to Cu (how?).

The quarantine room copper was coming from a hundred plus feet of new copper
pipe.  The fish were being constantly exposed to copper rich water.  The
copper is being removed by the RO to levels that are safe to the fish when
the general hardness is brought up by the salt solution.  I do not recall
what the RO water Cu was tested at.  The chloride cell damage is no longer a
problem.

><{{{>-- With ion exchange water softening replacement
><{{{>of divalent ions with sodium the chloride cell damage was
><{{{>gone but the fish
><{{{>died.

No, The symptoms were chronic not acute.  No fish died from the condition
they just did not reproduce.  The chloride cell damage was increased. With
ion exchange the cell damage was exacerbated due to a relationship between
Cu and Ca Mg and possibly alkalinity.


><{{{>With RO water plus salt (sodium chloride, I presume) they were OK.
yes, with the salt mix described above.


><{{{>So the copper was implicated by some reference I don't
><{{{>understand.

The reference is scientific literature.  I gave one reference that I had
handy.

><{{{>Where did the copper come from and how was it removed from the main
fish room?
><{{{>
><{{{>Lee Harper
><{{{>Media, PA
><{{{>USA
>

Best fishes
David

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