to the one who asked about Ph levels raising or lower ing well all depends on if you are soil or hydroponics this will definetly matter if soil grow ,you can use to raise ph level limestone now to lower powdered sulfur they have to be mixed in to the best of your ability without damaging your grow line and remember that as you do this you nutes will show a plus or negative in ph readings as well so mix slowly to combine ph balance with soil to nute mix ok,,,KGL