What Is Silt? Causes, Problems & How to Remove It

If your pond or lake has started to look murky, shallow, or less healthy than usual, there’s a good chance silt is the culprit. But what exactly is silt, how does it build up—and what can you do about it?

In this post, we’ll break down everything you need to know about silt and how to manage it effectively.

What Is Silt?

Silt is a fine, powdery sediment made up of soil, decaying organic matter (like leaves and algae), and other small particles. It settles at the bottom of ponds, lakes, and other waterbodies over time. While some silt is natural, excessive build-up can cause serious issues.

Why Does Silt Build Up?

Silt accumulation is a slow, often unnoticed process. Here are some of the most common causes:

• Leaf litter and plant debris falling into the water

• Dead algae and aquatic plants sinking to the bottom

• Runoff from nearby fields or gardens, especially after rain

• Feeding fish or waterfowl, which adds organic waste

• Poor circulation or stagnant water

Left unmanaged, can cause real problems as this build-up can result in a thick, smelly sludge that disrupts oxygen levels and aquatic life.

Signs You May Have a Silt Problem

Not sure if silt is affecting your pond or lake? Here are some signs to look for:

• Water is increasingly murky or cloudy

• Water depth is shallower than usual

• There’s a black, muddy layer on the bottom

• You notice unpleasant odours near the water

• Algae blooms or low oxygen events are more common

If you’re experiencing any of these issues, it’s time to take a closer look.

When silt levels become excessive, professional silt removal (also called desilting or dredging) may be necessary. This process removes the built-up sludge, restoring water depth and clarity.

At Simply Aquatic, we use a Truxor Amphibious Machine to dregde the waterbody and remove the silt, this is a low-impact technique designed to protect wildlife and restore balance to your pond or lake - find out more here.

If your waterbody is struggling with silt issues get in contact today to find out how we can support you.

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