im not knockin fox f or bio products, they work great! but i buy ALL my organic ferts locally and for less $. i have tried all kinds of ferts over the years and ferting this way works better than anything else ive seen. it has taken me a long time, but the right soil preperation and clean water is better than any liquid fert i ever used. if u can buy organic source of potassium for less than 5 bux locally, why order somethin from ? and pay more $ for the same damn thing?
that banana peel hsa to be composted before the k is available...shaking a peel in a jug just wont do it lol srry...and as far as finding the raw salts... go to sigma...the are a chemical company and the best source around for reagent grade salts http://www.sigmaaldrich.com/Area_of_Interest/The_Americas/United_States.html
tiger bloom used to be a nice single part nute, but a few years a go they changed the recipe so calcium and magnesium wouldnt bond in solution as quickly and "puff" the bottles. the new stuff isnt as nice I dont think.