I ended up putting down a 40 pound bag of gypsum in my yard today before we had a big thunderstorm. I saw my retired neighbor sitting in his garage while the storm just starting....so I walked over to watch the storm with him.....chat and catch up on the neighborhood gossip. He asked me what I just spread through my yard? I told him that I spread some gypsum on the side of the yard. Looking to see what it would do. He told me, before Scotts, Lesco, and any of the other large fertilizing companies starting selling fertilizer....Gypsum was the only product on the market people would use for their yards. Every yard would get gypsum and it was also used in gardens too. And that was how you took care of your yard back in the day. (Note... I didn't want to ask him how long ago this period of time was).... Gypsum is good of loosen heavy hard packed clay soils, by allowing moisture and air to penetrate and move freely in the soil. The pH - neutral source of soluble calcium and sulfur. Upon contact with moisture, the micro - sized particles quickly dissolves. It counteracts winter salt damage, repair animal spots in the yard, and can be applied anytime. So who out there uses Gypsum in their Yard Care System for their customers? Anyone have good results and or good stories to tell of their experiences with gypsum?