Does anyone have any experience with The Anderson's UltraMate SG? It is a soluble granule of 70% humic and fulvic acids, 14% potassium, and 6% sulfur. It is on clearance at AM Leonard, $70 for the equivalent of 7.5 gallons of 12% humic acid. I want to jump into the humic game but the price of N-Ext has me cautious and many of their products seem like slight variations of the same general mix. It seems to me that I could just add some kelp to Ultramate and have an RGS-like application or add molasses for an Air-8 type application.