It's a micronized Roots Organic product, so it's pretty soluble and can either be bubbled 24 hrs or just immediately drenched. Its bag guano, fish bone, feather meal, kelp, dolomite, crab, soybean,and kieserite( 3-7-4) the N is insoluble so great to feed a bubbled tea, calmag is 8%/1%, sulfur...