The King Technology POOL FROG Bac Pac 5051 (01-03-5880) a hands-free way to lower your chlorine levels in your swimming pool. When used with a FROG 5051 Mineral System, you can reduce chlorine usage by up to 50%! 

Features:

• Reduce Chlorine Usage by up to 50%!
• Works with the POOL FROG 5051 Mineral System.
• Single Pac.