So I bought an Intex 2650 sand filter/pump to replace the inferior pump that came with my 18' Ultra Frame. It is supposed to arrive today. I have a question about hooking up an actual vacuum. From browsing this forum and other resources, all vacuums seem to attach to the "thru the wall" skimmer or a vacuum adapter plate on a "thru the wall" skimmer. My question is this...can I hook up a vacuum directly to my new sand/filter pump? Or do I have to attach it to the port where my cheapie over the wall skimmer unit is located? Or do I have to have a "thru the wall" skimmer to use a true vacuum? Granted, I would love a "thru the wall" skimmer...but I'm a newbie and I'm taking baby steps with everything. Appreciate any insight.