© Tua Engineering Ltd. Malta 2010 Our range of filters can contain several types of media and gravel under bedding  depending on the application.  MULTIMEDIA FILTRATION is used for the removal of un-dissolved or  suspended particles. Typically these filters remove particles 5-15 microns in  size or larger. All media included in our filters are carefully selected according  to client’s requirement, so the media retains its stratification during backwash  and rinse.  BIRM is used for the removal of iron and manganese. High chlorine levels in  the water can damage the media.  GREENSAND is used for the removal of soluble iron, manganese, hydrogen  sulphide, arsenic and radium. High chlorine levels in the water can damage  the media. Minimum pH for use of this material is 6.2.  MTM sulphide, arsenic and radium. High chlorine levels in the water can  damage the media. This media requires regeneration with KMnO4.  ACTIVATED CARBON  is used to remove contaminants and impurities, utilizing  chemical adsorption. Carbon filters are most effective at removing chlorine,  sediment, and volatile organic compounds (VOCs) from water.  CALCITE is a natural crushed and screened calcium carbonate media which is  used to neutralise low pH waters. Calcium carbonate is slowly dissolved into  the water reducing the risk of corrosion.  GRANULAR FERRIC HYDROXIDE (GFH) is an adsorbent material used for the  selective removal of arsenic, phosphate, selenium and other heavy metals.  A WATER TREATMENT COMPANY