DEEP BED SAND FILTERS
 Colloide’s deep bed filter systems are a high performing and reliable solution for wastewater treatment. Each of our tertiary filters are engineered to meet the specific performance requirements of individual wastewater treatment plants.
These filters are designed with a filter bed depth of between 1000—2000 mm using a media
with range of approx. 2—3mm.
The media is carefully selected with the correct size, uniformity coefficient, roundness and
material qualities.
This media is supported on a bed of gravel to provide the necessary support during filtration
and distribution of water and air during the filter backwashing process.
| Some features of these filters include:
 • High filtration velocities are achievable, typically in the range of 10— 15 m3/m2/h.
• The deep bed effectively guarantees a high solids capture thus ensuring high performance
• This coarse media encourages solids to penetrate the bed, allowing the bed to store a large quantity of solids. This in turn results in longer run times and less backwashing.
• The filter can handle high solids loading.
• Our filter under-drain system is specifically designed to reduce the overall height of the filter while maximizing the efficiency of the backwashing process.
Furthermore, it has a very long life and does not block.
• A central launder runs along the length of the filter and is used to evenly distribute the incoming flow along the filter. This launder is then used to collect the dirty washwater.
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