In a message dated 5/15/2010 12:24:55 P.M. Eastern Daylight Time,
albell@SHAW.CA writes:

this  "advice" I will give you is only based on my other experiences
with strong  bases and aluminium, and not meant to pooh pooh draino
advice, but be  careful with draino, its lye, sodium hydroxide, and
strong solutions will  eat the aluminium up lickety split.

I'd be very very  careful.

alistair

Well we do mix it with water and I do know that of the dozen we have had to
 do like this have had no bad effects.  that has held true for more than 2
years for some of them.   Also isn't a lot of p traps and such made  from
aluminium??? and even plastic???  as normal YMMV and somebody always  is a
naysayer   !   but it has worked. but I do cover my  butt and tell the
customer that I can't gaurantee anything doing it like  such  later  mark d