- Silver Nitrate (1%) cartridge has 4 month lifespan.
- For use with Chlorine, Bromine or Ozone systems.
- Cartridge is 4-1/2" long, with (2) 4" spacer sticks included.
- Install in paper filter element, or next to water intake.
- 4 oz. supply sized for spas up to 500 gallons.