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Stormwater Filter Additives: What Works, What Doesn’t, and What Is Still To Be Learned


Low Impact Development (LID) stormwater filters, including everything from large bioretention cells to small filter boxes, are designed to intercept stormwater near the source and filter the majority of the flow for pollutants before release to the receiving surface waters.

While generally effective for particulates, filters have had mixed effectiveness for dissolved nutrients, organics, and metals. Many times effluent solutes show no significant reductions, and in some cases filters actually increase the concentration of pollutants.

Thus, there has been a steady interest in filter additives that will increase the retention or degradation of one or more pollutants. A somewhat bewildering range of materials have been proposed including plant compost, animal waste, iron filings, waste water residuals, industrial by-products, fly ash, and various biochars.

Join Forester University for this live, educational webinar as speaker Dr. Glenn O. Brown, Regents Professor Emeritus at Oklahoma State University, reviews and summarizes a number of additives that have been reported in the literature and provides guidance to those considering using them. His recommendations will be pollutant specific and based on both contaminant transport theory and demonstrated results.

An earlier version of this course was an invited presentation at the 18th Annual, EPA Region 6 Stormwater Conference.

Learning Objectives 
Attendees can expect the discussion and education of the following learning objectives:

  • Identify Stormwater Pollutants of Concern
  • Review treatment processes
  • Understand the characteristics of a good additive
  • Learn the four major additive categories, the pollutants that each category has the potential to treat, and the problems associated with each category
  • Examine documented testing of additives
  • Receive recommendations for practice

Train Your Team
Get the whole team trained! We offer additional savings if you register as a group. For group pricing information, contact us at

* Presentations are scheduled for approximately 1 hour with a 15-20 minute question and answer session to follow. Presentation may exceed scheduled time.
* Each state and certification agency has different requirements; it is your responsibility to know what they are. Note that 1 PDH = 0.1 CEU.
* Purchase of this course allows you access to the presentation(s) for 6 months from the order date.

On-Demand Webcast
Session: 1 H 30 M
Lectures: 1
Credits: 1 PDH / 0.1 CEU

Upcoming Webcasts > Stormwater ($79.00)


Special Group Pricing Available


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