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Catch Basin Filter

Product Details:

The dual chambered PIT BULL will attack your stormwater issues, providing multiple filtration options in one unit. As water enters the first chamber, sediment settles and is retained there. The second chamber is then set up with filtering media that filters the water. Simply choose the right filtering media for your specific needs.


  • This BMP removes hydrocarbons, heavy metals, sediments and other organics from stormwater and industrial runoff.
  • Exceeds 80% sediment removal efficiency.
  • Patented filtration system allows different filter media to be used together to remove targeted pollutants.
  • Choose a mix of filters to remove hydrocarbons/oil, chemicals, odor, phosphorus and heavy metals from water flow.
  • By-pass system prevents flooding or ponding during high-flow storm events.
  • Excellent post-construction control for drains that are more susceptible to large concentrations of contaminants (“Hot Spots”).
  • Units available for round or square catch basin grates. Custom sizes available.
  • Considered a “true filter” with separate chambers for sediment removal and filters.

Filter Media Options

Mix and match filter media depending on your specific needs. The PIT BULL allows you to use more than one type of filter media.
  • Oil/Hydrocarbon Filter Media- Used to remove oil, grease and other hydrocarbons
  • Phosphorous Filter Media- Excellent for removal of phosphorous where fertilizer and animal waste runoff is a concern
  • Activated Carbon Filter Media- Excellent "polishing media" that helps to remove certain chemicals, hydrocarbons and odors
  • Heavy Metal Filter Media- Custom filter media blend helps remove zinc, lead, copper and other harmful, heavy metals

PIT BULL with Sampling Option:

The Sampling Option is a convenient and effective means to obtain samples of the "post-treatment" effluent from the PIT BULL unit to comply with monitoring and testing requirements.
  • Sampling Option provides standard PIT BULL with modifications to allow Sample Collector (sold separately) to pull “post-treatment” water samples from below the unit’s filters.
  • Allows real-time sampling during storm events.
  • Access Tube stays capped until a sample is desired.
  • Simple sampling — No need to remove the PIT BULL to take a sample. Simply remove the grate, uncap the Access Tube, and insert the Sample Collector.
  • Sample Collector has a 60” long handle which makes collection quick and easy.

Item Number Item Type Specifications
S013 PIT BULL - Flat Frame 20" to 25"
S014 PIT BULL - Flat Frame 26" to 33"
S015 PIT BULL - Flat Frame 34" to 48"
S016 PIT BULL - Recessed Frame 20" to 25"
S017 PIT BULL - Recessed Frame 26" to 33"
S018 PIT BULL - Recessed Frame 34" to 48"
S024 Sampling Option
S025 Sample Collector
S019 Filter Media (2) Oil/Hydrocarbon Filters & (1) Activated Carbon Filter
S020 Filter Media Heavy Metal Filter
S021 Filter Media DePhosphorous Filter
S022 Filter Media Oil/Hydrocarbon Filter
S023 Filter Media Activated Carbon
*Note: All PIT BULL units are custom made to fit each individual catch basin. The final pricing is based on the configuration of the frame (Flat or Recessed) and number of required Filter Media (2 or 3). This cannot be fully determined until the end user has submitted the completed Measurement Instructions and Filter Media Selection forms. Please consult your United representative for more information.