Epsom salts PK Boosters
Any of you use epsom salts? I have a plant in flower and I wonder how much should I use, be it gr per liter (or gallon) or EC/PPM wise. My tap water is really soft (0.04 EC / 20 PPM).
Second, normally I use bloom nutes only after the soil is starting to become depleted. Recently I have got my hands on a PK booster with NPK of (5-32-40), when should I use this and how much of it (EC / PPM values)?