A zeolite filter is a fluid bed filter basically. The marine is pumped through the zeolite filter with the help of a pump which is filled with zeolite rock. Zeolite gives an ideal settlement area to the nitrogen-reducing bacteria and thus helps in the natural reduction of phosphate and nitrate values. The difference from the fluidized bed filters is that the zeolite filter usually has the option for cleaning. In addition to self-cleaning zeolite filters, zeolite filters with vibrating rods can also be found in the market. Thus the zeolite can be jolted and rinsed 1-2 times daily. Subsequently the bacteria build-up can be loosened by zeolite which then works effectively again.