I have a "Chameleon" sprayer. It has a dial on top. There is no instruction to tell me how to use the dial. I intend to use it to spray "Nematode" to kill grubs in mid August. Can someone tell me how to use the dial so I can get a more concentrate solution (say is 8 oz will give me more concentrated solution than 4 oz?) . I attached two photos for review. Thanks.