Spa Frog Serene Cartridge for Hot Tub 3 Mineral Cartridge for Floating Sanitizing System and Hot Tub Water Balance Guide

3 PACK REPLACEMENT CARTRIDGE FOR SPA FROG / SERENE HOT TUB SYSTEMS – Includes 1 Mineral Cartridge and Hot Tub Certified Water Balancing Guide instruction booklet.
FRESH MINERAL WATER HOT TUBS MADE EASY - The Spa Frog Serene hot tub replacement / refill cartridge kit eliminates the need for daily maintenance.
ENJOY SPARKLING CLEAN WATER WITH FAR LESS ODORS - Soft feeling water that’s easier on skin, swimsuits and spa surfaces.
SET IT AND FORGET IT FOR WEEKS AT A TIME - Eliminate the work and guesswork, Mineral Cartridges last a full 4 months and Bromine Cartridges last 2-4 weeks.
SUPER EFFECTIVE BACTERIA ELIMINATION - Spa Frog Serene Cartridges works by double-teaming bacteria with a patented delivery system of sanitizing minerals and a very low level of bromine.