Thank you all. The friendly salesman said that my filter would not be a good match for an IG pump for the reasons outlined by Mark. So I would have to buy a new pump and filter.

If I knew what I learned here last year, I would have opted for a small IG pump/filter combo as the price difference would have been relatively small. But now, even if I could sell my AG pump/filter used, it's a more expensive upgrade. I'll try to work with the equipment I have for now.

Carl, I used Cartridge Renu, purchased at the pool store. But I will try Electric dishwasher detergent next time. I'll also look for skimmer socks.

Eric