What is the best way to: How do I mix weed killer in a manual sprayer?

Choices: [+] Close the basin of the sprayer and pour in 3 cups of weed killer first and then 3 gallons of water, put the cap on and you are ready to spray. [+] Open the basin of the sprayer and pour in 3 cups of weed killer first and then 3 gallons of water, put the cap on and you are ready to spray.
Answer:
Open the basin of the sprayer and pour in 3 cups of weed killer first and then 3 gallons of water, put the cap on and you are ready to spray.