Tier1 15-1/2 in. x 6-5/8 in., 240 sq. ft. Pool & Spa Filter Cartridge for Jacuzzi J300 6541-383, J300 Series Hot Tubs (4-Pack) TIER1_PAS_1342_4_PACK - The Home Depot
Freeflow Spa and Freeflow Hot Tu Filter – Spring Dance Hot Tubs Online
Amazon.com: Jacuzzi 40 sq ft Proclarity Top Filter, 6473-157 : Patio, Lawn & Garden
Jacuzzi hot Tub Filter Part # 2540-381 – Hot Tub Supply Store