So my current mix of soil I am noticing is lacking in K a little and am looking for a good supplement. I was thinking of trying green sand as I have used silica in past grows and know this is a great source of that too. I am running a little different set up than most. I run a veg and a bloom mix layered in my pot. I am trying to use a few additives as possible to keep cost down and my mix simple. In my current bloom mix that I have cooking for the next grow I have my roots organic soil as the base, steer manure for my nitrogen, Mushroom compost for mineral and mild amounts of nutrients, bat guano for P, Epsom salt for mag and cal, and lime to correct the PH. As you can see I am lacking K. Was also thinking I could sub the mushroom compost for the green sand as it has a lot of minerals in it too.