It is not recommended to apply herbicides such as Monument 75WG Herbicide with a hose-end sprayer, as they do not provide the most accurate distribution. It would be best to apply with either a hand-pump or backpack sprayer. Your 2-gallon pump sprayer is likely fine.
Per the manufacturer's label, you will mix one packet of Monument 75WG Herbicide per 2 gallons of water, so your total would be 25 packets in 50 gallons of water. The degree of control resulting from application of Monument 75WG is primarily dependent upon weed species, weed size at application, environmental conditions, amount of Monument 75WG applied, and growing conditions. Growth of susceptible weeds is inhibited soon after application of Monument 75WG. The leaves of susceptible plants normally turn yellow, red or purple after several days, followed by necrosis and death of the growing point. Complete plant death occurs 1-3 weeks after application, depending upon weed species, growing conditions, etc. Please read and follow the label instructions.
Monument 75WG Herbicide can be tank mixed with RoundUp Pro as directed on both product labels.
