Chlorine or chlorine-containing compoundsare added by waterworks to kill germs. 

Reactions with natural organic compounds such as dead plant or algae residues, humic acids from soil or surface water, and other organic molecules from environmental sources can also form harmful compounds such as trihalomethanes (THM), haloacetic acids, and haloacetonitriles. 

Some studies have found evidence of possible links between the consumption of chlorinated drinking water and health effects such as lymphoma and cancers of the gastrointestinal tract and urinary tract. It is really important to filter out excessive concentrations of chlorine and its potentially harmful compounds.  

Then there is the issue of taste and smell.  

The smell of chlorine is particularly noticeable infreshly treated waterand is described by many people asslightly bitter, metallic, or "like a swimming pool." 

The intensity depends on: 

• chlorine concentration 
• Amount of organic matter in water 
• Water temperature and pH value 

With filbec, tap water tastes like water again.