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FROG Serene Mineral Replacement Cartridge for Hot Tubs

If you're looking for an easy and hassle-free way to keep your hot tub sanitized, look no further than the FROG Serene Replacement Cartridges. Designed for use in the FROG Serene In-Line System or FROG Serene Floating System


  • Pre-filled replacement cartridges for no mess, no guess and no stress water care!
  • Mineral Cartridge lasts 4 months.
  • Bromine Cartridge lasts 2-4 weeks.
  • Bromine Cartridges are recyclable when empty.