yup thats the one! cool, thanks, i am getting together all the necessities for my super soil. i may get some of the lava sand from that link, altho it doesn't look like it ground very fine, but its so inexpensive i may get it anyway and add it to other more finely ground rock powders i already have. this is pretty fun. i found 55 lbs of hi quality kelp meal for $55, which is a great deal. i also located some mulched tree leaves i can have for free in my area. everytime you dig up a shovelful all kinds of critters are running around, so its really teeming with life. so its going well.