Argh! You guys can get Potassium Permanganate down in the states at Sears, while up here in Canada, I have no source of it at all!
I've been looking all over, and when I went to Sears and asked, the salesperson insisted that Potassium chloride was what I was looking for (But I had told him that it wasn't for a water softener! :huh: )
Back on topic, you can also use an Alum dip (more like a bath) or a bleach (!!!) dip. With the bleach dip though, I'd be extremely careful with the kind of plants you dip in (don't try it on finely leafed plants i.e. Cabomba)