I am new to the fertilizing world. I am currently using granular fertilizer that covers about 9,000 sq per 40lbs bag. My cost is about $25 a bag. I am not making too much profit because I don't want to charge my customers an outrageous amount. I have a few accounts that are 30,000 - 50,000 sq that I mow and I would like to give them a reasonable rate to fertilize and also make a good profit. I am looking at a sprayer from tractor supply to start off with. It sprays at 2.1 gpm and has a 30 gal tank. I know its not big but it would do to start with. Here's the link. http://www.tractorsupply.com/en/store/countylinereg;-trailer-sprayer-30-gal Let me know if this is something I could make work for awhile or not.