I'm very new to this so I can't speak to efficiently of potash or SH in HHO systems. But I do work with potash and SH daily, and my first thought if either got into the engine would be I'll just have a cleaner engine. Now if I was to setup a dip tank and soak the block .... then we're talking something else entirely.

And are you guys buying the potash and SH premixed? I only use the bead/flake not much diff between the two.