We have 70 mowing customers and 30 chemical customers at between 4-7 apps per year. This year we were thinking about buying a spray rig and trying to double or triple our chemical customers for next year. I have a few questions. Right now we use granular for the pre-em, and all fert. only weed control is liquid. 1. How low do the tanks empty before the spray is too eratic to use. 2. Is it feasable to mix trimec etc for 10,000-15,000 sq ft in a 200 gal tank if you get a special request such as a new customer w/ bad weeds. Assuming the request comes after you have serviced all regular customers. 3. Any other advice is appreciated.