Epsom salts are magnesium sulfate btw, the more expensive products are magnesium oxide. The only catch is that taking a magnesium product can potentially impare the ability to absorb vitamins and minerals for 2 hours, especially vitamin C, so I would take the same time. If you did, worse case scenario nothing would happen and they would cancel each other out
I'm proposing you use a maintenance dose rather than a 'cleanse' dose. Sorry didn't think that was clear in my advice post