I live in Texas where we have nothing but hard a@@ clayto grow our grass on. Aeration is popular and helps but I was at Home Depot yesterday and they had pallets of Gypsum (sp?) layed out. The bag stated that it works to break up hard clay soils and works like a million tiny hoes to loosen your soil and help it breathe. Anybody use this and can you tell me how it worked for you?