I noticed this on pininterest, it said it removes salt from the soil. I figured we already decided it did nothing good for sand. So, I went to the link, found it and now I am to see if we can refute it. This site is making a ton of claims about epsom salt. They want one to buy their brand. I can get epsom salt cheap at Walgreens if I want it.
Here is a link that might be useful: epsom salt