I just bought a shurflo and I'm charging the battery. I used to use a hand pump that you carry, not the back pack type. Anyway there are three settings on the shurflo, fine, medium and fast. Should I be using the fast setting for spraying lawn with pesticide? and if anyone could tell me how much liquid is sprayed on a 1000 sq ft it would save me some time. and any other shurflo advice or stories are welcome too.