"White intensive bio-filter rings • High-quality sintered glass rings for intensive biological water clarifying. • Internal hole diameter only 5 mm, resulting in thicker wall depth and providing more effective surface for bacteria which breakdown pollutants. • 1 liter has 1200 m2 effective surface, 5 times as much as conventional clay tubes. Product description JBL SintoMec is a highly porous bio filter material made from sintered glass, which is particularly good for intensive biological long-term filtering in freshwater and marine aquariums. The special conical tunnel pore structure together with a wall thickness of 5 mm offers beneficial micro-organisms the best possible conditions. This guarantees efficient breakdown of the pollutants ammonium, nitrite and, with reduced current flow, also nitrate. The result is excellent water quality. The ring shape offers optimum water flow and long service life. Use Rinse well under tap water to remove any dust collected during transport. Place JBL SintoMec in the filter in such a way that it is protected from unnecessary soiling by a layer of JBL Symec which can be easily cleaned at regular intervals. JBL SintoMec should be rinsed briefly under running water from time to time. For optimum results, approximately half of the JBL SintoMec should be replaced by new rings after about 6 months. Press Release New intensive filter material from JBL for all filters JBL MicroMec and JBL SintoMec are the latest developments from JBL Research: the objective was a biological filter material which exceeds the effectiveness of previous materials and can be used in small filters. The capacity of existing filter materials to break down nitrates has been inadequate. The solution was found by designing the pores of the new high-quality sinter glass material with a special shape: conical tunnel pores cause a restriction in the flow of water in the filter material providing ideal colonization conditions for bacteria which decompose nitrates."