FROG Instant FROG for Pools - Prefilled Sanitizing Mineral Dispenser for Pools Up to 25,000 Gallons - Extends Chlorine Effectiveness for Easy Pool Treatment & Water MaintenanceBrand: FROG Features: Instant FROG for Pools: Innovative pool sanitizer solution ensures your swimming pool remains clean and crystal clear all season; this water treatment product adds FROG Sanitizing Minerals to your pool and lasts up to 6 months Pool Sanitizer Equipment: Prefilled pool maintenance system helps decrease chlorine use up to 50%* for softer, more enjoyable pool water Prefilled System: Instant FROG sits in the skimmer basket and