Subject: Re: Need Sand blasting Help
From: email@example.com (J. Kimberlin)
Date: 9 Sep 1995 17:28:08 -0700
In article <firstname.lastname@example.org>, Mike Rehmus <email@example.com> wrote:
>Might just find that dumping lye down the sewer is illegal. If you
>do much of it, best check it out or they may come visit you with
>very expensive charges.
Mike, I might disagree a little. A lot of the drain cleaners are simply
lye and toilet cleaners are lye too. Thousands of people do this every
weekend when cleaning their tubes. Municipal sewage treatment plants
monitor their pH quite closely. Basic, up to about pH 8 or 9 won't kill
the bacteria they depend upon for gas production and aerobic digestion.
On the other hand don't even think about dumping your sulfuric acid
copper pickle bath down the sewer. If you are near the sewage treatment
plant as I am, you could easily cause an upset. The rule in
environmental testing is to adjust the pH of samples to less than 2 to
inhibit bacterial growth. Basic doesn't really seem to hurt and is quite
diluted from general flushing, dishwashing, etc., so that a real slug of
concentrated sodium hydroxide, or other caustic substance ends up rather
I have to admit however, that removal of paint, grease and other cleaning
operations using caustic, produce an effluent that should not go down the
drain. The effluent is sometime high in lead, chrome, copper, zinc, tin,
and other metals that kill the beasties we all expect to see when we
vacation at the seashore or on the river banks.