Remember to rinse the filter media under the tap before putting into your filter to remove any dust from the media. This can be either done by rinsing the media under the tap whilst in the net provided or if you are putting the media direct into the media trays, do this and then run the tray under the tap.
WARNING: DO NOT USE ANY DETERGENTS, CLEANING CHEMICALS OR SOAPS
When putting the filter media into the trays you must make sure the netted or lose filter media is spread evenly over the tray. This is because water will flow using the easiest possible route. If there are any large gaps between the filter media and the walls of your filter, the water will flow down the sides and not efficiently through the media. If you use the Carbon or Ceramics in the nets provided make sure they are evenly touching the sides of the filter for full effectiveness.