Re: Urea

> From: larry at creative_net (Larry Frank)
> Subject: Urea
> What is the chemical formula for urea, and in
> what concentration will this be toxic to fish?

	Urea is H2NCONH2.  I suspect it is not very toxic in itself,
but it will be hydrolysed in water to ammonia and carbon dioxide.
The ammonia could easily be a problem!  I would not go above about
0.25 ppm urea in the tank water for just this reason.

Paul Sears      Ottawa, Canada