Synergy Tabs- 4.5 Lbs With dual active ingredients, Synergy&reg; Tabs are unique in that they offer a higher sanitizer efficiency by up to 30%. These tabs are specially formulated with a patented erosion control agent and are meant to be used in automatic and floating type feeders. Synergy&reg; Tabs are designed to dissolve more cleanly in automatic feeders, making maintenance easier while improving the quality of your pool water. Synergy&reg; is a unique sanitizing system for use in any pool. The Synergy&reg; system is compatible with Enjoy&trade;, Sustain&reg;, Simplicity, Snap and Relax. NOTE: Simplicity and Snap systems are compatible with Synergy&reg; and may be used interchangeably when Synergy&reg; boxes are sold out or no longer available.