What is the stuff at the bottom of a pond called?
What is the stuff at the bottom of a pond called? Pond sludge goes by many names; mulm, muck, sediment, and a few more colorful terms. It is simply an accumulation of organic debris that settles in the pond bottom. Most commonly the sludge will be a mixture of leaves, fish waste, decaying plant debris, dead algae, and debris washed into the pond with rain run off.
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