When rain falls the water has a naturally aggressive, slightly accidic nature. This water then dissolves chalk and/or metallic deposits in the local strata, resulting in ground and borehole water containing elements that would not normally be present in mains water.
Contaminents such as iron and manganese can cause problems such as poor tasting and potentially harmful drinking water and staining of appliances and equipment.
These can be removed from water by using media that encourages reaction between the contaminent and oxygen present in the water.
This reaction creates an insoluble precipate that can be filtered out by the media bed, the reaction is catalitic and is not used up as part of the process giving long life to the filter.
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