The Hel-X 17 Bio type of media is kept moving via aeration in the filter; the so-called moving bed. This is often used in combination with a drum filter. It also provides excellent performance when used with a trickle filter.

Air-Aqua offers this media in three different diameters: 11, 13 and 17 mm. The smaller the diameter, the greater the media surface area per m3.

13 mm -> 300,000 pieces/m3 -> 767 m2/m3
17 mm -> 150,000 pieces/m3 -> 595 m2/m3

100 Litre Bag