yeah man done a fair bit of research over the net got a brill site tells you stuff like this. 'In general, plants need the following materials in a water solution: - nitrogen, phosphorus, and sulphur for the construction of cells; - magnesium to manufacture chlorophyll; - potassium, calcium, and magnesium for osmotic processes; - water for growth, for the transport of nutrients, and for sturdiness; - iron, boron, copper, manganese, and zinc as building materials.' It tells you pretty much everything, I just wondered if any time served growers had info on products which contain these chemicals. if anyone is interested in the site go to. How to grow marijuana in rockwool.