Just curious, how long does Baquacil last in a closed pool. I've purchased a swamp that's been closed at least two years. Just this past weekend I found some paperwork and a test kit relating to baquacil in the garage. I'm not sure if it was used or not. What happens to the Baqua levels in a pool that's not maintained? I'm hoping it's gone by now, it's already going to take a load of bleach to shock this swamp without Baquacil adding to it.