The evolution of hydrogen gas is what produces the agitation.

bob g.

George wrote:
And hydrogen gas.

"Robert Galloway" wrote in message
...

The comment about metal in oven cleaner is a good one. Drano has
aluminum chips in it. The lye attacks the aluminum and produces heat
and agitation. Good in a clogged drain but probably not much help in
your project. (Not aware of what the downside might be.)