Catch basin inserts (like the Ultra-Drain Guard) are very effective and 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).
  • A 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. 

 WARNING: This product can expose you to chemicals including nickel, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.


Part # Description Fits Drains in. (mm) Where to Buy
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)
9478 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 Where to Buy
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 (PDF)

Written specification

Heavy Metal Removal Media - Safety Data Sheet (SDS)

Heavy Metal Removal Media - Data Sheet


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

Article - Stormwater Drain Guards vs. Filter Socks vs. Catch Basin Filtering Systems

Frequently Asked Questions

How many filters will fit in an Ultra-HydroKleen? 
The HydroKleen is designed to fit up to three filters.


If I order different types of filters, how do I know what order they should be arranged?
The order will depend on the concentration of the pollutants in the water and may require some experimentation to get the best results. Typically, if an activated carbon filter is used, it will be the last filter media before the water exits the HydroKleen as it is a "polishing" media.


Is there a way to take a post-treatment sample with the HydroKleen? 
Yes, a sampling option is available that will allow "post-treatment" samples to be taken. The sampling option is part number 9876 and MUST be ordered with the HydroKleen (it cannot be installed as a retrofit).


What are the dimensions of the body of the Ultra-HydroKleen (the green shell)?
The body of the HydroKleen is 15" x 19" and 19" deep.


How often should I change the filters? 
This will depend on the location of the unit and will vary for each HydroKleen. We recommend an inspection after the first rainfall to get an idea of what the pollutant load is for that particular drain. Periodic inspections and water testing will help determine the efficiency of each filter and when replacements are necessary.


What's the easiest way to remove captured sediment from the Ultra-HydroKleen?
Sediment, silt, sand, and dirt can be scooped out of the HydroKleen's chamber or, for complete removal, the entire HydroKleen can be removed from the catch basin and hosed out.


What is the ordering process like for the Ultra-HydroKleen?
Initially, the process is just like any other product, it is ordered through one of our distributors. But once we receive that order we will coordinate with your distributor to get more information on the catch basin that the HydroKleen will be installed in. We will need to get the  Measurement Instructions and Filter Media Selection forms completed and returned to us. Because of the customization of this product, there is a lead time involved. Once all the information is provided we will be able to provide you with an estimated lead time.

  • 40 CFR 122.26