Blast advances the decomposition of organic matter in ponds and lakes through a proprietary blend of multiple strains and species of beneficial bacteria. Blast is best used in combination with the AquaSpherePRO as a means to compensate for seasonal spikes in nutrients and temperature. Use Blast in the beginning of the season if you are seeing organic floating material or in the consecutive months following if you see organic material form within the pond. Blast is packaged in pre-measured, easy to dispense packets. Each water soluble packet treats up to 83,000 gallons and will dissolve within 30 seconds of being in water. Make sure your hands are dry before handling the water soluble packs. Blast differs from Vista in the concentration and doses for ponds and lakes. Veterinarian approved and safe for all fish, pets, wildlife and plants.