Replacement Pool & Spa Filter: C-6430 (71826, 71825, FC-3915, PWK30, 60301) filter cartridge features 30 square feet of 3-ounce basis weight media that catches debris and particles, keeping your hot tub water clear.  Compatible with Caldera Vacanza, Tarino, Celio, HSS Highlife Models, HotSpot TX, SX, Strid and Pace spas.