The EHEIM activated carbon pad is a open-cell filter foam, fully impregnated with special activated carbon. The foam pad adsorbent to dissolved harmful substances, colorants as well as residues of medicaments. Active carbon filter pads for the EHEIM external filters 2222 and 2224. Also suitable for the thermo filters 2322 and 2324 and the models eXperience 150, 250 and 250T. Active carbon pads are used after medications, to reducing pollution or smells. Packing contains 3 pieces.Do you have questions about this article ?