these people know what they are doing. I tried myself for 3 years. it took a lot of work, and I could never get things coated evenly. Fertilizer left different shades of green on the grass. Barely any broadleaf weed control unless I dump a ton on it. I've had another company come out and it was even, but very slight results. This year I went with Irish Green and the results are obvious the very next day. The grass turns emerald green, and the clover, dandelions, etc wilt and turn yellow overnight. You can see the result crystal clear every application. It's pretty amazing, and the best part is it is costing me less than if I did it myself, with all the store-bought chemical I would have to dump on the lawn to get half the results.