Tier1 15.5 in. x 6.63 in. 60 sq. ft. Spa Cartridge Filter For 6541-383 (2-Pack) and Pool Filter Cleaning Brush TIER1_PAS_1342_WAND_BRUSH_2_PACK - The Home Depot
Hot Tub Spa Filter C-4326 - Fits Artesian Canadian Spa SC704 - AliExpress
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