The Bacteria packs have a 24 month shelf life from date of purchase.Sometimes the packaging might start to break down after 12 months or so but the water clearing bacteria is still good for the full 24 months.
Outdoor Water Solutions Water-Clearing Bacteria, 50 Pack of 8oz. Pouches, Model# PSP0132

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- Helps reduce nutrients and organic matter for clearer ponds and lakes
- Helps reduce algea by eliminating their food source
- Easy to handle packets prevent waste from spillage
- 25 lbs. of bacteria, enough to clear a 1/2 to 1 acre pond for a whole season
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