I originally had a chameleon sprayer which did not work well at all.  I purchased the spectracide brand weed killer and filled up this Gilmour 362, set the dial to 2 tablespoons, and went to town.  All my weeds in the yard are now gone in two weeks.  The design is great, cleanup is easy, and this will last a very long time.  I am very happy with this purchase and thank everyone for their reviews of this product.