Algae is a pool owner’s worst nightmare. But a single dose of FROG Leap ALL-OUT 01-10-7872 ensures only pleasant dreams all season long. Unlike most algae preventatives that need weekly doses, FROG Leap ALL-OUT is one dose that guarantees an algae-free pool for 90 full days. It also helps protect the pool all winter long so spring opening is a lot easier. ALL-OUT dispenses (without a spill!) through any FROG Leap System in less than 90 minutes.