Intex Floating Chemical Dispenser for PureSpa, 5-Inch Holds up to 1 and no.34; (2.5Cm) Chlorine or bromine tablets Made of durable non-corrosive polypropylene material Adjustable control ring to control the release of chemical Twist-Lock cap; Suitable for Intex pools up to 12' (3.66m) And PureSpa Designed for use with Intex PureSpa models 28403/28404/28413/28414/28421/28422/28423/28424/28443/28444/28453/28454