WSA 40mm - 75mm Washed Filter Media
For large-scale soakaways and land drainage systems where water volumes are significant, this is the filter media grading that keeps things moving
WSA 40mm - 75mm Washed Filter Media Suppliers Cheshire
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Coarser isn't always better, but for high-volume drainage, it usually is
Filter media aggregates work by creating void space within a drainage layer, space that water can occupy and move through freely. The larger the particle size, the greater the void ratio and the faster water can travel through the system. For most standard residential drainage applications, a finer grading does the job comfortably. But when the volumes increase, whether that's a large soakaway handling significant surface water runoff or an extensive land drainage scheme across a development site, the drainage layer needs to keep up. That's the situation WSA 40mm - 75mm was designed for.
At this grading, the aggregate produces an exceptionally open structure that prioritises flow above everything else. Combined with the washing process that removes fines and impurities before the material leaves the yard, it stays open and free-draining over time
Typical Applications
It tends to appear on larger, more engineered drainage schemes rather than standard residential work Large soakaway structures, extensive agricultural and development land drainage, civil engineering schemes with high flow rate requirements and infrastructure projects with formally engineered drainage designs are the main homes for this material. It also gets specified in situations where ground conditions are working against the drainage system, heavy clay soils being the obvious example, and the filter media needs to compensate by maximising flow capacity within the aggregate layer itself.
For straightforward domestic soakaways and standard drainage runs, WSA 20mm - 40mm is usually the more appropriate specification. The 40mm - 75mm grading is where projects step up in scale or complexity, and where an engineer or drainage designer has determined that a coarser, higher-flow material is what the system needs to function correctly.
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As an experienced recycled aggregate supplier, we can also offer a range of other materials, including:
WSA 3mm Washed Grit Sand
A fine, clean, washed grit sand with particle sizes up to 3mm. Ideal for general construction purposes, particularly for bedding paving slabs and block paving. It offers excellent drainage and is also used for plastering and rendering applications.
WSA 5mm – 10mm Pipe Bedding
A medium-sized aggregate, washed and screened, suitable for use as bedding material in pipe laying projects. The 5mm to 10mm grading ensures optimal support and drainage around underground pipes, reducing the risk of movement or damage.
WSA 10mm – 20mm Pipe Bedding
Larger-sized washed aggregate for pipe bedding, offering enhanced drainage and structural support. The 10mm to 20mm grading is particularly suited for larger drainage and utility pipe systems, providing stability and preventing soil infiltration.
WSA 20mm – 40mm Washed Filter Media
A coarser washed aggregate used as a filter media for water management systems, ensuring efficient drainage. The 20mm to 40mm particle size makes it perfect for land drainage, soakaways, and filtration projects.
Puddle Clay
A natural clay material, typically used to create watertight barriers. It is ideal for use in ponds, lakes, and canal construction, preventing water seepage due to its low permeability. Puddle clay is also employed in landfill sites as part of the liner system.
MOT Type 1 Sub Base
A widely used sub-base material made from crushed stone or gravel, with particles ranging up to 40mm. MOT Type 1 is commonly used in the construction of roads, driveways, and paths due to its strength and load-bearing properties. It forms a stable, compacted foundation layer that can support heavy traffic.
As Dug Top Soil (BS3882)
A natural topsoil, taken directly from site and screened for larger debris, compliant with BS3882 standards. It provides a nutrient-rich medium for landscaping and general gardening purposes, supporting healthy plant growth.
Screened Top Soil (BS3882)
High-quality, screened topsoil that meets the BS3882 standard for multi-purpose use. It is free from stones and debris, making it suitable for a variety of landscaping and garden projects. It promotes excellent drainage and plant growth due to its balanced texture and nutrient content.
6F2 Crushed Hardcore
A recycled aggregate consisting of crushed concrete, brick, and stone, used in construction as a bulk fill material. 6F2 is typically used for road base layers, foundations, and general groundwork, providing a strong and durable sub-base.
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