I decided to try a Lebanon Pro product in my spreader. Has anyone ever used the 30-5-10 w/ PolyXpro in a lesco rotary spreader? The label says set the spreader to I , in numeric terms that means 20 for my spreader. There is no way I am going to cover 15,000 sq. Ft. set on 20. Then I went to Lebanon's site to look up spreader setting and it says 17. Can't be?? I put 50 lbs of 19-19-19 with a bigger particle and I set it on 17 to cover 9,500 sq. Ft. Anyone know the correct setting. I don't have time to set up cans and pans to calibrate. If no one has the answer I may have to.