Easy to use - simply replace the old cartridge with a new one every two weeks. Air release valve for air trapped inside filter chamber.Sediment flush falve at bottom of filter chamber. Works with 18-feet Easy Set, 18-feet Metal Frame, or 18-feet by 10-feet Oval Frame pools. The item "Filter Pump for Above Ground Pools INTEX 28633EG 2500 Gallon GFCI 110-120V NEW" is in sale since Monday, December 24, 2018. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Pool Equipment & Parts\Pool Pumps". The seller is "fastshipstore**" and is located in TX. This item can be shipped to United States.