zero 0 I prefer nothing . roots in 5 to 10 days plain ph water . now other people use a thousand dollars worth of clone solution tell you its very good . read the ingredients its just nutrients . now if you want to get technical there is a lot of data out there saying solutions slows down root formation . why should the clone form roots to search for nutrients when its available for it right now ? I am not saying the plant will not form roots with the solution . but I am saying just because they sell it does not mean it works . there are a lot of opinions on this in my experience using clone solution vs not . side by side results my rooted clones come from ones with plain ph water . http://hydrodynamicsintl.com/media/wysiwyg/Documents/clonex/CCS_Qt_1.pdf lok the same as any nutrient ?
to answer your question here . http://hydrodynamicsintl.com/clonex-clone-solution.html