Thermal stratification in a pond means that there is a noticeable temperature difference as the water gets deeper. Normal thermal stratification begins to occur in May and can continue through September. The cold water at the bottom the pond supports anaerobic bacteria. This bacteria is not helpful in decomposition. When leaves and other organic matter are deposited on the pond’s floor, they will not decompose quickly and black pond muck will form. Installing an aeration system in the pond will lead to more aerobic bacteria throughout the pond. This is the bacteria that will aid in decomposition. If the black pond muck is allowed to accumulate, the pond may need to be dredged which can be costly.
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