Using epsom salt for mag deficiency.

Hey guys. My stems are turning purple and leaves yellow. I read that a tbsp of Epsom salt in a gallon can cure this problem because of the magnesium in it. Is this a good idea and if so how many times should I water it with the salt.
I water about 4 times a week and I can't afford cal mag.
I do have a blooming nute coming in, tiger bloom but I need some help on this topic really bad.

yep that'll do it, what are you growing in and what are you ph ing at ?

Just one root soaking with Epsom at 1 TBSP per Gallon of water will solve the problem if your diagnosis is correct.