Quote Originally Posted by PoolDoc View Post
...
If the seal is at the cartridge bottom, it shouldn't matter, But if the cartridge seals at the opening, it will matter. ...

Well, that makes sense. I'll see if I can find out anything further.

Reading reviews at the Walmart website (of the A/C filters they sell there -- not Unicel brand), one sees quite a few complaints from people who say that the filter opening is the right size for Summer Escapes pumps, but too small for Intex -- a lot of those Intex owners ended up trimming material to enlarge the opening. That certainly made me wonder if the Unicel 4607 filters, which apparently have the larger opening to begin with, would be too loose in our pump.

I'll try calling Unicel, and/or just buying one of the Unicel filters to see how it works. If I find out anything definite, I'll update.