On 30 Oct 2005 at 3:39, keith_w wrote: > I can't speak to the presence of other contaminants like tannins and > other water colorants, but I'd suppose any plant acid like that could > not be particularly good for a human (or fish, or animal) to drink in > any quantity, either. > > All of which goes to say that one needs a number of tests to determine > potability, not just visual clarity.
There are various fish, amphibians and insects that survive best in water containing tannins and there are many creatures who require mud, man made pollutants are another thing but I don't see it specified anywhere by I suspect potable only really refers to human consumption AFAIK, we are a weak lot. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
