24 Packets treats 4,000 gallons for up to 6 weeks. CrystalClear Spring & Fall Prep contains cold water natural bacteria designed to accelerate the decomposition of leaves, twigs, muck and other sediment during the fall and winter months while replenishing winter bacteria loss during the spring. These easy-to-use, water soluble packets should be applied weekly to keep your pond looking its best even when water temperatures are between 35 to 60 degrees F.