Right now I pretty much power rake, aerate, mow, pressure wash, etc. A whole bunch of my customers are really fed up with the service they get from the liquid fert. guys here in my town. They pretty much miss a bunch of the yard and do it so fast that its very ineffective. My customers are all willing to use me if I start offering this. I know I need to take an exam with my county or state and get my lic. for it but what the liquid concentrate? Where do I get my supplies? I have a trailer that I can dedicate for a tank and pump. Could someone tell me where to get the chemicals and send pics of there setups.