It works a whole lot better than just the skimmer. Although the skimmer does well. It just creates this stronge vacume that sucks everything on top of the pool. I live in the Country and we seem to have alot of bugs and after a mow alot of grass ends up floating on the top of the pool. The poolskim just sucks it all in the net that attaches and you can just empty it. I empty mine just about everyday and there is always stuff in there. You may not need one if you do not have alot of things get in your pool. I have a 33 ft round and I love the poolskim.