Greetings experts I'm just a homeowner, not a pro, and I need some advice. I read all the post's concerning backpack sprayers and Nutsedge, but I still have some questions. My St. Augustine has been infested with Nutsedge. Over the past 3 years it has gotten worse and worse. This year I plan to get it under control and get my lawn back. I have a little less than 1 acre of Floritam and plan to spray Sedgehammer or Manage soon. I'm concerned about the physical toll the spraying might take on me (health issue). My questions are: 1. With a hand pump style backback sprayer how long will it take to treat say .8 acre? 2. How much pumping will be required? Would an average middle-aged male be worn out by this? 3. Should I spend more and get an electric like a Sureflow? 4. With a 5 gallon pack, how many times will I need to refill to treat the .8 acre? Thanks Much to all who respond!