I will add my two cents to this discussion. If you know you are going to keep an above ground pool for the next 5 years or more, I would suggest getting a real Hayward (or similar) pool pump. A 3/4 hp should and will be fine. Number two, if you want to keep with carts, then look at one of the real cartridge filters from the big guys. Yes they will run a couple of hundred dollars, but you will or can get a 50, 100 or even 150 sq foot filter. That means once, twice, maybe three times a year clean and not pitching the Intex filter every 5 days.
The above in my recommendation. Now because I don't anticipate having my Intex setup around past this summer.....I got the big 2650 filter/pump that has the bigger "B" filters, and ordered Unicell "B" sized replacement filters. They are much better: filter better, last longer, all around superior filter compared to throw away mentality of the Intex stuff.
Since I have had my setup for the past 4 years, I have had to replace my Intex pump every year. So even if I had blown the money for a nice single speed Hayward 3/4 hp pump and one of the 50sq ft cart filter setups.....I would be even or a bit ahead by now.
Bob E.