If your pond is occasionally troubled by algae blooms or accumulated organic debris, here???s a way to restore its natural beauty quickly and effectively. Blast is a non-toxic, proprietary blend of beneficial bacteria that breaks down the organic matter that clouds up your water. Most effective when used in conjunction with the Aquasphere (sold separately). Contains non-toxic, proprietary beneficial bacteria that break down organic matter Most effective when used with the Aquasphere 3 lbs. (12 packets) per box Each box treats a 1/4 acre pond for 5 weeks 2 boxes clean a 1 acre pond for 5 weeks Contains a proprietary blend of beneficial bacteria