Janet is right -- they ALL contain copper. Copper does help control algae, but will stain your pool. It will ALSO turn blonde hair green. If you don't mind the stains, and have no blonde haired swimmers, go ahead. Otherwise, I'd recommend passing on them.

I did check and all of the listed 2012 Intex SWCGs with available manuals include copper -- 1 system did not have a manual, so I couldn't tell. The sales literature is sometimes misleading, and does not mention the copper. You actually have to download and read the manual to be sure.

You can check for youself, on this page:
Intex saltwater system web page