FreshWater Salt Cartridge | Salt System Refill Brand_DuraVent Both cartridges share the exact

Both cartridges share the exact same 4-15/16 inch diameter and the same open 2-1/8 inch end caps

Watkins Wellness 76840 Control Box

Superior Performance – Patent Pending

1 x Heatilator Simon 33 Front (Novus)

even at the same nominal 1-1/2" size — SAE is coarse and straight-sided

FreshWater Salt Cartridge | Salt System Refill Brand_DuraVent Both cartridges share the exactThe FreshWater Salt System Replacement Cartridge is the titanium electrode cartridge (sometimes called the "cell") that powers the FreshWater Salt System Watkins Wellness's saltwater sanitization technology built into compatible Hot Spring and Caldera hot tubs. It's the consumable component that converts dissolved salt into a steady, automatic supply of pure chlorine, keeping your spa water clean for months without measuring or dosing chlorine by