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

[LeeH920226 at aol_com]

In a message dated 2/5/03 1:39:26 PM, david at zfin_org writes:

<< 

So anyway our water treatment company suggested that we add a water softener

to remove Ca and MG but it would also remove the Cu.  Well it did remove all

of those, the copper went from around 1 ppm down to 9 ppb (analyzed via the

EPA Copper 220.2 method).  Unfortunately the removal of the general hardness

from the water and our lack of karbonate hardness actually made the water

several times more toxic!  The hardness was non detectable with standard

aquaculture kits (LaMotte). >>

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?  With 
carbon filtration they were chronically ill from carbon induced chloride cell 
damage linked to Cu (how?). With ion exchange water softening -- replacement 
of divalent ions with sodium the chloride cell damage was gone but the fish 
died. With RO water plus salt (sodium chloride, I presume) they were OK. So 
the copper was implicated by some reference I don't understand. Where did the 
copper come from and how was it removed from the main fish room?

Lee Harper
Media, PA 
USA
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