Not too Happy with MC myself lately - I still have over 12 lbs. of each 5-12-26/0-0-15. I do love this "Old" Product line, and I am not fully convinced the change is detrimental. MC's Claim the "New Formula" will "Out-Perform" Jacks (or their own) 5-12-26. I'm in Coco so have always used (at half strength) Botanicaire Cal/Mag Plus(Iron) and PowerSi, w/ My base (A/B) Nutrients ..(they removed the Potassium Silicate too) Si02, They also removed the Kelp, this might be a push to move their Sea-K Product? (as I posted above they no longer offer the 6.6lbs-which is total crap!) My next Purchase will be the Small Bags of the New Product (3lbs),I will do a few runs before I make a Judgement/or go back to Jacks(JR Peters)..as I left Jacks for MC and have not regretted that decision, as yet. @redeye are you using the "new formula"? please post your success/fail? to this thread...(@greenleafnutrients please send a free sample of the "new formula" my way, enough for (18 wks) a full Sativa Run, I always run 3 plants in my Sativa (tall) Tent)