Non-woven catch basin inserts are stormwater filtration devices made from non-woven geotextile fabrics designed to fit inside standard catch basins. They are often referred to as “witches hats” due to their conical shape.
Features:
Non-woven geotextile construction – Made from durable, high-flow fabrics offering excellent filtration and strength.
Drop-in design – Fits easily beneath standard storm drain grates without the need for tools or modifications.
Fine filtration – Captures fine particles with an Apparent Opening Size (AOS) typically between 70–80 sieve.
Overflow protection – Designed to prevent bypass and ensure controlled flow even during heavy rainfall.
Custom sizing – Available in standard and custom dimensions to fit a variety of inlet types.
Benefits:
Improves water quality – Effectively traps sediment, trash, and pollutants before they enter the stormwater system.
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