Quote Originally Posted by grey1223
If you are using tap water you should be fine on mg and cal. If ro water you will definately need the cal-mag. If you use it with tap water I'd suggest once every 2 weeks. It certainly woun'thurt anything.
Thanks for the help grey. This will save me some time and money. I wasn't planning on buying it but one of my hydro friends said since I'm using part coco in my soil mix I should get some. Not sure if this is true but I didn't want to take any chances. Thanks again