Blagdon have created an excellent range of filter media which will remove all trace of grime from your pond. Every aspect of filtration is covered, with suitable media for mechanical, biological and chemical filtration.
Foam sets are available and will remove all particles of grime and muck, simply pick the corresponding pack for your filter.
Biological filtration is covered too with the Blagdon Ceramic Biological Filer Media. These ceramic rings have a large surface area which promotes the growth of healthy bacteria. The holes allow the water to flow through freely, exposing as much of it as possible to the nutrient eating bacteria.