RE: Cu/Zn dechlorination was: Recycling activated charcoal

["David Lains" <david at zfin_org>]

We had chloride cell damage in zebrafish gills at copper levels as low as 5
parts per BILLION! in soft water.  Copper toxicity decreases with increase
general hardness.  Food for thought.

Best fishes
David

><{{{>-----Original Message-----
><{{{>From: owner-killietalk at aka_org [mailto:owner-killietalk at aka_org]On
><{{{>Behalf Of George Slusarczuk
><{{{>Sent: Tuesday, February 04, 2003 8:53 AM
><{{{>To: killietalk at aka_org
><{{{>Subject: Re: Cu/Zn dechlorination was: Recycling activated charcoal
><{{{>
><{{{>
><{{{>Hello Lee,
><{{{>
><{{{>I share your worry, that copper/zinc are probably leaching into the
><{{{>water. We have known for a long time, that copper leaches from fresh
><{{{>copper pipes. In order to act as a _filter_ (at 4 gal/min flow) the
><{{{>Cu/Zn surface area has to be huge. Leaching is almost inevitable.
><{{{>
><{{{>If it is a _couple_, than by definition both copper and zinc ions will
><{{{>be in solution at some time. What happens to those ions?
><{{{>
><{{{>Best,
><{{{>
><{{{>George
><{{{>
><{{{>
><{{{>
><{{{>LeeH920226 at aol_com wrote:
><{{{>>
><{{{>> In a message dated 2/4/03 1:22:53 PM, jwwiii at pacbell_net writes:
><{{{>>
><{{{>> <<  Can
><{{{>> anyone explain exactly what is different about this product and the
><{{{>> common Cu-Zn alloy (aka brass) used for plumbing fixtures
><{{{>for centuries? :-)
><{{{>> >>
><{{{>>
><{{{>> Maybe I can, now that I read more about it. I believe this
><{{{>is a zinc/copper
><{{{>> couple not an alloy. There is a lot more information at
><{{{>other sites than the
><{{{>> one I cited first. Such as:
><{{{>> http://www.tbaytel.net/gjgourle/index.htm
><{{{>> http://www.purewaterforu.com/whatiskdf.html
><{{{>> http://www.naturalsolutions1.com/rainbal1.htm
><{{{>> http://www.kdfft.com/
><{{{>>
><{{{>>     The claims about removing chloramine are a little
><{{{>vague. Rates may be
><{{{>> slower and may not work under some conditions. Another
><{{{>concern that I have is
><{{{>> the inhibiting effects claimed on biological activity,
><{{{>especially focused on
><{{{>> microorganisms, but what about fish, daphnia, etc.? What is
><{{{>the fate of the
><{{{>> copper and zinc? Is it leached into the effluent gradually? Will the
><{{{>> concentration of zinc and copper be harmful?
><{{{>>     Someone may have to run an experiment ;-?
><{{{>>
><{{{>> Lee Harper
><{{{>> Media, PA
><{{{>> USA
><{{{>> ---------------
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