Never used it. Could it benefit your lawn ? Probably yes, Quote from their site "It's unique combination of benefical microbes and organic humates promotes a more green and lush canopy within the first week. By turning your lawn clippings into fertilizer for your lawn, it helps your lawn feed itself." I wonder how the keep their unique combo of beneficial microbes alive during handling and shipping. Anyway, your organic feeding and maintenance is adequately keeping your microbes alive and well. You don't need this stuff. Consider compost. Look at my profile for my take on compost.