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 2%......It can be used as a standalone nutrient too so can feed & get a tea in!! Plus I like the Terp profile that bat guano produces, I don't go heavy with but I like to use it up to about week 5/6 so not combating any salts when ripening. There is an amino acid that is only found in guano, and fish scales, called guanine that is responsible for the plants DNA & RNA makeup so I'm of the opinion to unlock pheno expressions, its DNA & RNA has to be functioning properly so I use whole fish ferments in veg that litterally has scales floating in the bottle and I use lite Terp Tea when building flowers. My 2 cents anyways.