Hot Tub in-Line Cartridges Replacement is Copmatible with Frog @Ease in-Line SmartChlor Cartridge for Marquis, Caldera, Artesian, Hot Springs Spas, and hot tubs up to 600 gallons. 5 Packs Ideal for:? Owners seeking hassle-free maintenance Families prioritizing skin-friendly water care Budget-conscious spa enthusiasts Legal Disclaimer Frog is a registered trademark, which is not affiliated or otherwise associated with Vickmons. or this site. Vickmons acknowledges and confirms that it has not been granted any license or authority from Frog, Inc to use the mark, and further confirms that any and all use of the mark on this site is for identification and descriptive purposes only and such use is not intended to, does not, and shall not be deemed to imply any association or affiliation between Frog, Inc and Vickmons of any nature whatsoever.