I was skeptical about this but didn't have a choice. My lawn was overtaken by brown spots that kept growing and expanding and spreading to different areas. Could have been a number of causes but I had no idea. My lawn guy had no idea, so I decided to give this a try. 3 weeks later, my lawn is beautiful again. 95% of the problems cured! Some really bad spots are still regrowing but as you can see, it's green!!!! I would definitely try to but this again next year as a preventative in the spring. So worth the money. My yard is tennis court size and one bag was plenty to cover it all.