which Intex saltwater pump?

I bought the Intex 9x18 4,500 gallon pool which came with a Krystal Clear 1200 gph Sand Filter Pump. I want to add a saltwater system. Can someone please help me figure out which of these I need to purchase, which would be compatible with the pump I already have? http://www.walmart.com/search/search...ex%20saltwater
I am not sure I’ll be able to get the stand-alone saltwater pumps in Canada, but that’s a bridge I’ll cross when I get to it. Right now all Walmart Canada lists are the combination saltwater-sandfilter systems and that seems redundant since I already have the pump.
I am aware of the copper ionizer issue, and plan to disconnect it if I can figure out how. Thanks!