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Replacement mineral cartridge for the Spa FROG Serene Floating System or pre-installed Spa FROG inline system.
Designed specifically for 2015 Michael Phelps Swim Spas this sensor is a replacement for the sensor in your spa’s heating system allowing you to control the heat of your spa from the external control panel. If you don’t see your model listed, it may still work – so please give our customer service a call!









