I think I know what you are talking about. I have no experience with these types of skimmers. But I did find a link that may help. The documentation is rather poor.
From this link download Wall Mount Surface Skimmer - USA (80PO).pdf
Here is the link
http://www.intexdevelopment.com/proi...gid=2&lid=5473
Not sure, but I would think the suction would pull it down enough to create the skimming effect. Might need some adjustments?
Sorry I can't help more.
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