Lawn Sprayer

How many of you spray your yard for weeds? I usually put on some kind of dry chemical on the grass to help keep the crabgrass away and I have a hand held sprayer that I can mix liquid weed killer. I had also purchased one of those hose end sprayers and was ready to apply the stuff tonight. I had already done much of the front yard and noticed that the container still had the same amount in it as when I started. Bummer!! I then tried to see why the sprayer was not working correctly. No such luck. I then got out the old hand held unit. I was glad I had it in the garage. I am now thinking about buying a new hose end model.