Blast Pond Water Cleaner advances the decomposition of organic matter in a pond or lake through a proprietary blend of multiple strains and species of beneficial bacteria. Blast is best used in combination with the Healthy Ponds All Purpose Water Cleaner dispenser or AquaLily dispenser, as a means to compensate for seasonal spikes in nutrients and temperature. Use Blast in your pond at the beginning of the season if you are seeing organic floating material already started, or in the consecutive months if you start to see organic material form within the pond. Blast comes in 15 pre-measured, easy to dispense packets. Each packet treats up to 2,500 gallons. The water soluble bags will dissolve in the water within minutes of tossing in the pond. Make sure your hands are dry before handling the water soluble packs.