Found this:::
Quote Originally Posted by Zandor
When you feed your plants with RO water you need CalMag Plus to put back minerals the RO process removes but the plant still needs.

Epsom salt is to treat magnesium immobile.
Over on this link:::
http://boards.cannabis.com/showthrea...t=calmag+water
turtle420 Reviewed by turtle420 on . What strain would you pick? Hello guys, As you may know, I'm about to begin my first grow. Overview: 1000W, cabinet LST SCRoG, hydro NFT I've got two strains: White Widow and Bubblelicious For the experienced, what strain do you suggest? I'm going to plant only one of them. Rating: 5