Simply slips down the inside of most hot tub filter cartridges
Water feels softer with no faded suits or smelly odors
Keeps water clean with less chlorine or bromine
Lasts 4 months with convenient reminder dial
The original Spa Frog in-filter mineral system is an effective way to care for hot tub water that reduces chlorine or bromine use. In fact, with minerals doing the bulk of the job, you can use up to 50% less than standard spa water treatments.