Chris,
At the last 5 courses that I worked at, I had a 800 gallon mix tank from A.D. Williams (
adwsprayers@msn.com). The last one that I purchased was right around $3500. Very aggressive agitation. Urea, FeSO4, KNO3 what ever you want to throw in the mix. I can not go without having one.
Jeff Gyselman GCS
Black Bull Golf Club
Bozeman, MT