Helpfull news to all who run PM ride-ons. Since we upgraded to a 12-volt battery + a 3.0 gpm pump, we noticed a stricking difference......No more cleaning out screens several times a day (actually it's about every 3 weeks now), and the spray is constant. Also no adjusting of nozzles throughout the day. Seems the increased flow has solved several problems. We currently cover about 25,000 sq. ft. per eight gallon tank-full, and seldom have any weed control complaints from customers. We are even knocking out creeping Charlie. Even the edges are clean of weeds! We run in high gear about 3650 - 3950 rpm's. (yes -- we "tweaked" things a little bit). Hope this gives you guys some help, americanlawn + americanlawn (m).