i used the free sample in soil, so im not much help about it being used in a hydro application, but i really liked the stuff. tried to get more, but the shop i buy from didnt have any of it, so i ended up going with humboldt's myco madness.
good luck finding the answer to hydro applications. i assume its a 1/4 or 1/2 tspn per gallon of water though.
