Drain cleaner contains Al snippets which makes it unsuitable for electrolysis and it is more dangerous in the use it is intended for as H2 gas is
released when adding water to it.
Wouldn't Al metal be extremely easy to remove from NaOH? For example why not just dissolve the NaOH in water, filter out any insolubles (which should
include Al metal) then boil off the water?
EDIT: I didn't think that through before I replied. -OH ions react with Al metal so a reaction would occur as soon as you dissolved the NaOH. The
product of that reaction may be easy to separate from NaOH though.
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