AG filters tend to come in combo units with the pump where as the IG filters do not and there definitely IS a difference between an AG pump and an IG pump due to priming but really there is not much of a difference in the filters other than perhaps size. AG cartridge filters tend to come in sizes below 200 sq-ft where as IG filters come in all sizes up to 525 sq-ft.

So if you are shopping for a AG combo unit (filter and pump), then I would target the 100 sq-ft size or larger for that size pool. More specifically, because the way they match the filter and pump, I would suggest the Pentair PNCC0150OF216.