3 Gray Spa Mineral Silver Ion Cartridge Sticks (12-month supply)
Mineral cartridge sticks for hot tubs; provides year-long maintenance with quarterly replacement. Users note easy installation and clear water, though fit may vary by tub
Highlights
- annual maintenance with quarterly sticks
- universal fit
- cost-efficient maintenance
Pros
- year-long supply
- universal fit design
- easy installation
Cons
- fit compatibility varies by tub
- mixed reports on zinc content / silver ion specifics
Best For
Features
- Yearly supply: one mineral stick lasts a quarter; three sticks cover a year
- Universal fit for most hot tubs with 1-1/4 inch filter hole and 6.59 inch length
- Advanced mineral ion technology provides controlled mineral release in varying temperatures and usage
- Continuous operation for spas up to 600 gallons with long-lasting crystal-clear water
