Vicsin, let me readdress your original post with a question......are you thinking swimming pools will be part of your life for awhile?
I ask this as the problem with ANY Intex pump attached to any filter type is only a one shot device. What I mean here is that in particular, the electric motor for the pump IS the problem. Having examined my failed 2650 pump/cartridge setup from earlier this year I can tell you that it is not made to be repaired. Can it? I believe so, but with great effort compared to the "major" manufacturers pump setups. The Intex electrical motor is a very heavy, open frame motor, but the problem is that the bearings are not what most of us would consider good bearings.
May I recommend if you are serious about this AGP thing, and in particular, if you plan on getting a larger pool this next season, look at the setups from one of the major manufactures that have a separate (or rebuildable) pump. Your choice of sand, DE or cartridges......that will in my opinion, save you money AND save you frustration over the years.
Bob E.