Used this for approximately 23K sq ft of a mix of cool season grasses. Initially mixed using 1.2gal/4oz and it was thick. Sprayed with a 12 gallon Chapin sprayer with foliar tips. All the grass has a white residue left after drying. I attempted to wash off with garden hose but it's on there good. Next batch diluted to about 1.5gal/4oz and the sprayer clogged. Had to empty the tank into a 5 gallon bucket, clean the strainer and dilute the rest. Even then the 12v pump struggled. My recommendation is to use at least 3-4gal/4oz. I am assuming the white residue is normal. It even appeared at the more dilute rate as you still apply the 4oz/K. Will let you know how it works on my fungus ridden yard, brown patch mainly.