The media used in trickling filters needs a high surface area but must have a sufficiently open structure not to restrict the natural draft air flow.

Traditional filters used blast furnace slag but modern plastic media like Biofil and Bioball provide a much higher surface area per unit volume of media with a low air side pressure drop. This makes these media ideal for replacing old media and uprating existing filters.

Selecting the right media will also enhance nitrification by providing a protected area for the growth of nitrifying bacteria.

Advantages of Warden Biomedia

  • Easy replacement of old or damaged media

  • Improved performance

  • Reduced “snails problems”

  • High resistance to erosion