The Spa Frog Serene Bromine Cartridge (253#) is designed for use with the Spa Frog Serene floating system. This yellow bromine cartridge provides a steady, controlled release of bromine to maintain clean, clear, and comfortable spa water with minimal effort.

By regulating bromine output automatically, the Serene system reduces daily maintenance, minimizes chemical odors, and keeps water feeling soft and inviting. Each cartridge lasts up to four weeks depending on spa size and usage, making it a reliable choice for routine spa care.