I have used for farm soils and nutes. I bhad very good and consistent nresults. The only reason I stopped using fox farm soil is because I can't get it at a reasonable price. So I make my own soil test days. It's pretty simple. Intake kellogs brand patio plus, I can get it at Lowe's or home depot for less than 10.00 for 2 cubic feet. Then I mix in an 8lb bag of buffaloam compost, a bag of bone meal, sphangam peat moss, and perlite. That's it. Incan run autos straight through wit no nutes. Ill dose cal\mag as needed, and water with PhD water.