Catch basin inserts (like the Ultra-Drain Guard) are very effective an work well in many applications. 

In known "hot spot" drains, however, something with more filtering capability may be necessary.  Because these drains are more likely to encounter more concentrated contamination in stormwater, dedicated filter media can help in reducing pollutants. 

The Ultra-HydroKleen is considered a "true filter" by the EPA and forces water through up to three different filters before it exits into the stormwater system.

Advanced catch basin filter captures multiple pollutants 
  • 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 removes hydrocarbons / oil, chemicals, odor, phosphorus and heavy metals from water flow (must be ordered separately).
  • 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.*.


  • Helps comply with NPDES, 40 CFR 122.26 (1999) and TMDL requirements.
  • Considered a "true filter" and has been verified by the EPA's ETV program. Click here to download the report.





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Mix and match filter media depending on your specific needs. HydroKleen is the only catch basin filter that allows you to use more than one type of filter media.*

  • Sorb 44 — Used to remove oil and other hydrocarbons.
  • Phos Filter — Excellent for removal of phosphorous.
  • Activated Carbon — Excellent "polishing media". Helps remove certain chemicals, hydrocarbons and odors.
  • Heavy Metal Removal — Custom filter media blend helps remove zinc, lead, copper and other harmful, heavy metals.
  • Other types of media available for custom applications.





Convenient and effective means to obtain samples of the post-treatment effluent from the Ultra-HydroKleen to comply with monitoring and testing requirements.

  • Sampling Option provides standard HydroKleen with modifications to allow the Ultra-Universal Sampler (sold separately) to pull "post-treatment" water samples from below the unit's filters.
  • Take real-time samples during storm events.
  • Access area stays closed until a sample is desired.
  • Simple sampling — No need to remove the Ultra-Hydrokleen to take a sample (in many cases, even the grate can remain in place). Simply slide open the sampling port and insert the Universal Sampler. 


Part # Description Fits Drains in. (mm)
9870 Flat Frame* 20 - 25 (508 - 635)
9871 Flat Frame* 26 - 33 (660 - 838)
9872 Flat Frame* 34 - 48 (863 - 1,219)
9873 Recessed Frame* 20 - 25 (508 - 635)
9874 Recessed Frame* 26 - 33 (660 - 838)
9875 Recessed Frame* 34 - 48 (863 - 1,219)
9878 Custom Frame* Custom
9876 Sampling Option -

* Note: Ultra-HydroKleen 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 determined until the end user has submitted the completed Measurement Instructions and Filter Media Selection forms. Please contact us at 800-353-1611 for more information.

Filter Media Blends

Part # Description
9463 Media*: Activated Carbon
9462 Media*: Sorb 44
9461 Media*: Phos Filter
9460 Media*: Heavy Metal Removal

More info / Downloads


Maintenance and care

Installation instructions for Hydrokleen

Filter media selection form

Installation instructions for replacement media

How to measure for Hydrokleen


Data sheet

Spec drawing (DWG)

Written specification

Spec drawing (PDF)


Testing report from EPA's ETV program

Amendment to EPA's ETV report

Follow up report done by Robert Pitt Ph.D., P.E., DEE

  • 40 CFR 122.26