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I just discovered a very informative link to The Regional Municipality
of Ottawa-Carleton. It explains a bit about the effects of chloramine
on fish. Try
which takes one to the middle of it.
About granulated carbon filters they say,
"Granular activated carbon filters can be effective in removing colour,
taste, odours and some chemicals (certain types of organic chemicals
and pesticides) if they are present in the water. These units can also
remove some types of chlorine. The effectiveness of this type of filter
depends on its size and the length of time the water is in contact with
the carbon. The larger the filter and the longer the contact time, the
more effective it will be at removing these substances. The American
Water Works Association has described small cartridge units that attach
to the tap as "totally useless", because of their size and the brief
exposure time. Granular activated carbon filters by themselves will
not remove lead and other heavy metals and will not soften the water."
They also suggest that residual chloramine levels be kept below
0.1 ppm to avoid poisoning fish.
ac554 at FreeNet_Carleton.ca