Pool Frog's Bam unique formula will keep algae from forming for 90 days whether you have an in ground or above ground swimming pool. Combined with the mineral effectiveness of Pool Frog and at least 0.5 ppm of chlorine, you'll enjoy months of algae free pool water! Pool Frog Bam contains a low 3% copper complex (considerably lower than any other algaestats) that is especially formulated to stay in suspension for the full 90 days. This unique formula has no staining potential like other copper additives. Pool Frog Bam was designed to be dispensed through the Pool Frog System for even distribution throughout the pool over the 90 minute time period.