BLACK BIO SPONGE 20 inch x 20 Inch x 2 Inch
Super Grade 20″x20″x2″ Black Sponge for external filters, sumps, and pond filters
Excellent water permeability.
Can be used again after cleaning.
Can be cut in any size you are need.
Suitable for use in freshwater and marine water.
Cultivate the nitrifying bacteria for biological filtration.
Offers good biochemical and physical filtration effects.