This Ortho Weed B Gon product is simple to use. All you have to do is connect your water hose to it and there is a 3 position switch at the top (Off / Water / On).
If you want just water to come out, put it in the Water position. If you set it to the On position, then it will mix the product with the water, and you can spray and treat your lawn.
You spray the lawn that needs to be treated and make sure you have a hose long enough to reach the entire lawn. This product is safe for lawn (I have Bermudagrass). Refer to the label for instructions.
Overall it’s an easy product to use and helps with killing the weeks you have.