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used it all summer for my outdoor, still doing it, works great. Use half grow half blow to desired ec, transitioning into just bloom for the rest of october. Didn't even measure ph (although I don't recommend that inside). Growing everything, not just cannabis strains.
Everything looked awesome until rain from Hurricane Faye fucked up my passive hydro beds - was only able to partially recover from the flooding, but learned for next year, I digress..
Use the sheet on canna stats (they have a way to add maxi nutes to it) to adjust your ppms - don't worry about the high K - coco does not just have an affinity to K, but rather any of the positive ions, K/Ca/Mg - so its more about ppms, overall ratios and ph, in which 50/50 mix will get you real close to h3ad,lucas,etc, and from what I have used (flora,maxi) the gh products are super stable
http://www.angelfire.com/cantina/fourtwenty/index.html, they have a ppm spreadsheet on the downloads page and then on the nute-o-rama page, you can get the maxi info to add to it. One you have the file setup, you are free to play with the ratios and get a realtime ppm breakdown.