Hey guys, We have had problems with backpack sprayers from day one. We have tried the stihl SG20 and had decent results with it although after a short period of time the pump will stop holding pressure or it will start leaking. We have also tried the Lesco backpack sprayers as well but have the same problem. They will stop holding pressure resulting in you killing your arm pumping to maintain pressure. Does anyone have any other suggestions of sprayers that seem to last? We do quite a bit of spraying every year and typically use the sprayer every day. Thanks for any input!