"Ian Hodge" "i dot hodge at tiscali dot co dot uk" wrote

having a young son, I am concerned that disposing of used dev, fix etc
down the kitchen sink may not be a good idea.

Unless your son likes to do very strange things with the drain plumbing
I can not see any harm.

Are you sure your son is not telepathically transmitting nightmares about
'Big Hairy Things That Come Out of the Drains at Night'?

I'd be more worried about the biologicals at the bottom of the sink
trap. But then I wouldn't be much worried about those either.

In comparison with other hazards in the house B&W chemicals are close
to the bottom of the list. The worst of them may be 'Pyro', and
that's just boiled acorn juice.

In my family it is the fastidious side that suffers from odd
undiagnosable health complaints and allergies.

Look at:

http://www.respiratoryreviews.com/ja...3_hygiene.html

And make sure your son gets his full pound of dirt a day.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.