Thank you for all the answers! I hadn´t exspected so many!
I have been taking less then 1/2 a teaspoon (more like 1/3) for maybe 5 days now. The only thing I´ve noticed is that I´ve gotten real bad eczemas on my elbows. I do usualy get just a tiny spot there about ones a month but this time it´s been worse then ever and I´m almost surten that it is because of the epsom salt. The things I had red about that could be because of a magnesium deficiency, like muscle twitching and rising hart-beat, hasn´t stoped. So eather it´s because I don´t have a magnesium deficiency and my problems are because of something else, or I have problems absorbing the magnesium from this form (because it binds with water like some of you wrote).