What is a silt filter chamber and why do I need one?


A silt filter chamber – also known as a ‘silt trap’ – is a basin that is set upstream of a
soakaway crate. It is designed to prevent silt, soil, sediment, metals or pesticides
from entering and damaging the water storage system, and acts like a filter.

How? Well, a silt chamber holds the water for quite some time, allowing unwanted
materials to sink to the bottom of the basin and separate from the water. These
systems are designed to collect and remove surface water, either by emptying it into
the sewer or allowing it to drain back into the ground below.

So, why do you need a silt trap?

Silt can cause all sorts of problems for your drainage system. For example, it can:

  • Block pipes
  • Increase the risk of water not draining properly
  • Cause soakaways and attenuation tanks to fill quicker, reducing their capacity
    for holding water
  • Cause flooding on the surface

What’s more, it can leave you with no other option but to purchase a new water
storage system.

There is an array of new and improved soakaway crate systems on the market today
which are a lot better at avoiding silt problems. Yet, despite this, silt traps remain the
best method for protecting soakaways and attenuation tanks by capturing silt further
up the drainage system.

As water fills the chamber, the silt settles at the bottom in a filter tube whilst filtered
water continues to your storage system. And the best bit is the filter tube can be
easily disconnected from the outlet pipe for regular cleaning and maintenance.

Sounds good, doesn’t it? If you would like to know more about the silt filter chambers
we supply, here at Cotterill Civils, please don’t hesitate to get in touch with our team.
You can either call 0121 351 3230 or email [email protected], and we’ll
get back to you.

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