In a message dated 5/15/2010 1:25:15 P.M. Eastern Daylight Time,
albell@SHAW.CA writes:

as I  said, i don't want to argue, just stating the facts so you  know.

solutions of lye/draino,/NaOH  will attack aluminium. its  just a
fact. if you are comfortable with that then  ok.

alistair

hello Alistair  No Problem, I know very well what some of them  do.   we
tested a couple of different brands of this stuff before  using it,   Some
drain cleaner stuff mixed with aluminium foil in a  sealed  liter coke bottle
had a very explosive effect.  Some didn't  ??   The Draino brand didn't.,
mind you we didn't have a sealed system  on the heater core as we left it open
and was mixed with warm water.   later  mark d.