Unicel C-8465 Replacement Filter Cartridge for 65 Square Foot Hot Springs Spas/Watkins Mfg

Unicel C-8465 65 Square Foot Media Replacement Hot Tub Spa Filter Cartridge with 234 Pleats, Compatible with Hot Springs, Caldera, & Tiger River Spas

FROG @Ease Mineral Cartridge + SmartChlor Cartridges for Marquis, Caldera, Artesian & Hot Springs Spas - Hot Tub Sanitizer, CYA Free, for up to 600 Gallons

FROG @Ease in-Line SmartChlor Replacement Chlorine Cartridge 3-Pack for Marquis Spas, Caldera Spas, Artesian Spas and Hot Springs Spas up to 600 gallons; Hot Tub Sanitizer with No Cyanuric Acid