Same outstanding quality and value as our 1" chlorine tabs, but faster dissolving for immediate results. These 3" chlorine tabs have a perfect balance of 90% available swimming pool chlorine and 99% active ingredient to stop bacteria and algae growth in its tracks. Plus, they’re stabilized against the sun’s destructive UV rays. That means that you’re preventing swimming pool chlorine burn-off because the chlorine is locked in the pool water so you use less swimming pool chemicals.