As more and more matter heads to the bottom of your pond, more and more oxygen will be needed for decomposition, which means that the oxygen levels in your pond drop and this can harm your fish. While a small amount of sludge is normal and poses no real risk to your pond, as this sludge builds up and covers more and more of the bottom of your pond, there can be several negative consequences.įirst, in order for this organic matter to decompose, oxygen has to be present. Sludge also can contain inorganic substances such as sand or silt or clay. Sludge is a mix of decaying organic matter, and this might include animal waste, dead leaves, grass clippings, fish food and just about anything else that finds its way into your pond and begins to decompose. Let’s take a quick look at what comprises sludge and why it affects your pond water negatively. This can be a lot of work, but we do have a few tips that can make the process easier. Cleaning sludge from the bottom of your pond probably isn’t high on your list of favorite activities, but it is an essential task that will help keep your pond water as healthy as possible.
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