I can attest that fish are very sensitive (I used it to kill algae on
my air stone, in spite of repeated rinsing and aeration it killed all
the fish in a few hours when I reintroduced that air stone)

I seem to remember the Canadian government wanting to ban the stuff
due to environmental concerns - the consensus was that it does more
good than harm and we are too dependant on it to stop using.

[url]http://pmep.cce.cornell.edu/profiles/miscpesticides/methylchloride-xanthangum/hypochlorite/anti-prof-hypochlorite.html[/url]

Has an MSDS for sodium hypochlorite. Bear in mind that when they give
the 192 milligrams per kilogram toxicity they are talking about the
pure stuff not a 6% solution.

The key words being UNDER NORMAL HOUSEHOLD USE . . .


[url]http://www.esemag.com/0596/bleach.html[/url]

Has this to say:
Under normal household use, sodium hypochlorite is broken down in the
environment into table salt, oxygen and water. Other
substances may be formed, to a small extent. These by-products are
most often referred to as AOX (adsorbable organic
halides). A great many studies have been made to provide a risk
assessment of household bleach in terms of its formation of
AOX.

The conclusions drawn were:

the amount of AOX is very small both in absolute terms and
relative to other human activities and natural sources,
the majority of these AOX are easily degradable,
the AOXs formed are primarily water soluble and not
bio-accumulative.
highly chlorinated species, such as dioxins, are not formed.

The conclusion of the Swedish Environmental Research Institute was
that sodium hypochlorite "does most probably not create
environmental problems when used in the right manner and in
recommended quantities".


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