Did you get a sand filter? A cartridge filter will not pull a vacuum, and is bound to be a PITA.
The Intex sand filter system will fit, make sure to get the adapters. Huge increase in water flow! Then get a real deal pool hose, vacuum head and extension stick, got mine at Lowes. There are relief valves integrated into the inlet and outlet valves that come with the sand filter kit. They are there for kid safety. They will reduce the vacuum to useless levels.
My pool has a thru-wall skimmer, so there is no suction hazard. I am planning on sealing the relief valve on the suction side to allow full vacuum. Once again, I have no suction hazard with a skimmer. If your situation has ANY suction hazard, please ignore this post, or install a skimmer