Amazon.com : SUMMERBUDDY Pool Filter Pump, 1000 GPH Above Ground Pool Pump and Filter, Swimming Pool Filter Pump for Intex Pool/Bestway/Easy Set Pool/Metal Frame Pool, 110-120V with GFCI, 1 Pool Filter Cartridge :
Amazon.com : BIHARNT 6 Pack Type A or C Replacement Pool Filter Cartridge Compatible with Intex 29000E/59900E Easy Set Pool : Patio, Lawn & Garden
Amazon.com : Intex Pool Easy Set Type A Replacement Filter Pump Cartridge (8 Pack) | 29000E : Patio, Lawn & Garden
INTEX Type A Filter Cartridge 59900
Intex Intex Filter Cartridge A Pump and Filter Union in the Pool Filter & Skimmer System Parts department at Lowes.com