FROG® Serene Mineral Cartridge


Each FROG Serene Mineral Cartridge last for a full 4 months before needing to be replaced.

  • Refill for use in either the spa frog floating system, or for users of the spa frog inline system
  • Use with companion frog bromine cartridge (yellow cartridge)
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The FROG Serene Mineral Cartridge refill for use in either the Spa Frog Floating System, or for users of the Spa Frog Inline System which is factory-installed in the spa. Use with companion Frog Bromine Cartridge.

  • Mineral Water System for spas up to 600 gallons
  • The Mineral Cartridge will last four months or until you change water. The Bromine Cartridges will last two to four weeks
  • Pre-filled cartridges so you don’t have to guess
  • Easiest water care system, no measuring or filling floaters with pucks
  • Eliminates bacteria with 50% less sanitizer
  • Our Bromine cartridges are recyclable

Additional information

Weight N/A
Dimensions N/A

Single, 2-pack, 6-pack, 12-pack

Average Rating


( 8 Reviews )
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8 Reviews For This Product

  1. 08

    by John Schneider (Not the Duke of Hazzard)

    Cost Effective Great Product. It works well with the bromine cartridges to provide clean clear sanitary water.

  2. 08

    by Paula Dalby

    We switched from Chlorine to Bromine and this system has been wonderful. The water is nice and clear and we don’t have that awful Chlorine smell. So much better on our skin.

  3. 08

    by Jim Getten

    These keep my hot tub cleaner than anything. They last for months.

  4. 08

    by Scott

    Arrived as expected and works as expected. Always love the process of getting something ordered and arriving quickly.

  5. 08

    by Charles Ressler

    Not much can go wrong with a mineral cartridge and it is just what I expected. The problem is that I ordered it on June 1 as a Prime Member and it did not arrive until today, June 6. Not the delivery speed I was hoping for.

  6. 08

    by CME36

    This cartridge makes hot tub maintenance a breeze. Pop it in, and let it do its work for clear clean water. It says to replace every 4 months but mine lasts longer than that. Definitely recommend if you don’t like to have to remember to continually add stain and scale control chemicals into your tub.

  7. 08

    by Michael M. Bush

    Replaced this in my hot tub the other week, and I think it definitely makes a difference on how the water makes my skin feel when getting out.

  8. 08

    by Boheme PDX

    Does it work – hard to tell. I wish there was a refillable option so there wasn’t all this extra plastic going into the landfill. Or that I could buy one that lasted a year instead of quarterly. At least this is better than monthly. Check out spa cuzn for a natural alternative to bromine and no plastic! I’ve made the switch and it’s the most low maintenance spa solution!

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FROG Serene Mineral Cartridge

FROG® Serene Mineral Cartridge


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