[quote:f240b78ea5]Drano is anhydrous HCl and Al flakes. It 'fizzes' as HCl goes into solution and interacts with the Al ions, producing hydrogen gas[/quote:f240b78ea5]      Are you sure about this?  It was my understanding sodium hydroxide reacts with aluminum to produce the "fizz" in most drain cleaners (incl. Drano).  The "fizz" being caused by the production of hydrogen gas due to the reaction of the base (NaOH), [i:f240b78ea5]not HCl[/i:f240b78ea5], with the aluminum.