A 22' Intex has about 10,800 gallons, filled.
Either the Hayward or the Intex combo below should be acceptable. The Intex has more features and capacity, but I'd guess the Hayward is more reliable.
Intex:Intex 56671EG 2,650-Gallon Sand Filter SF20110 Pump
Manufacturer's info page.
Manual
Hayward:Hayward VL40T32 VL Series Top-Mount Sand Filter System 1800 GPH
Manufacturer's info page.
Manual
Bookmarks