Pool Frog Mineral Reservoir Replacement 6100 The Pool Frog Cycler serves as a "water treatment center" and controls the flow of water through all Frog components. For above ground pools up to 25,000 gallons. Holds the minerals and fits inside the Pool Frog Cycler. Must be replaced every six months or after one pool season whichever is shorter. Use with the Pool Frog System for Algae Protection (sold separately) Pre-filled with chlorine tablets and fits inside the Pool Frog Mineral Reservoir (sold separately)