One of my customers has a contuial problem with thatch build up. I had a soil test done, said pH was off, aeriated in fall, deyathched in spring, treated that, mowed with a bagger last year, & used organic fert(to help build up soil), thios was all last year. The lawn still built up thatch over last summer, I'm at a loss, never had this happen. I called co-op extension, they told me to try core aeration, then topdress with pelitized compost, I think it will be a had sell, and I don't know it will work. Any ideas??? thanks in advance.