Thought there should be a lawn forum on the internet and found it last night. Been spraying approximately 10 to 12 years......started out with a 4 wheeler and a 10' boom........then a zero turn with front mount boom.......last year graduated to a Lesco space saver and the chemlawn gun. Have not been able to get the chemlawn at 2 to 3 gpm to effectively kill crabgrass....2 to 3 ounces per gallon....but I can burn the crap out of bermuda or zoysia. Coverage is just not there for me. Changed to an adjustable spray wand and the 3/8" hose and get a fair to good kill (75% to 90%). But, the 20" wand will literally wear you out by noon. What do you recommend using for the application of MSMA? Chemlawn is good for pre-emerge and broadleaf in the fall and spring!