FreshWater Ag+ Silver Ion Sanitizer | Hot Tub Autoship Its trilobal fibers

Its trilobal fibers

Granular chlorine is hygroscopic (it pulls moisture from the air)

What sets this cartridge apart is the heavier media

EPA-approved

Owners who skip this step end up with cloudy water and assume the cartridge is defective — it isn't

FreshWater Ag+ Silver Ion Sanitizer | Hot Tub Autoship Its trilobal fibersThe FreshWater Ag+ Silver Ion Sanitizer is a supplemental sanitizing cartridge that slots into your spa's filter standpipe and releases a steady stream of positively charged silver ions into the water for approximately four months. Those silver ions inhibit bacterial growth continuously, meaning you can run your spa on a much lower chlorine residual than a chlorine only spa would require. This is one of the most popular FreshWater products because it