Thanks for the link. After playing around with it for awhile, it appears that the blue piece floats and the thing actually pulls the water toward the skimmer by sucking it from between the basket and the receptacle piece, but any trash that comes to it has to go over the lip of the blue thing and into the basket. It's really hard to explain, but I think I've got it working for now. The owners of the pool come home tomorrow and I think I'll ask for the owner's manual for awhile!! At any rate, the pool is now back to crystal clear, so it's apparently doing the job.

Janet