Water filtration

Filtration of water is a method of combating micro-organisms. Water filtration systems treat only bacteria which pass the filter and should be regarded as a gatekeeper. 

Ultrafiltration is used for filtration of incoming water from the water works. Ultrafilters, or membrane filters, are effective against bacteria, viruses, suspended particles and other unwanted elements from the water. 

The pressure loss in the ultrafilter is very high. In many cases it is necessary to install a water boosting system in order to maintain the correct water pressure at the consumers tap. 

Advantages:

• Effective against free bacteria floating in the water 
• Does not affect smell and taste of the water 
• Not sensitive to pH value of the water 
• No chemicals are used

Disadvantages:

• There is no long-term effect on bacteria etc.
• Biofilm in hot water tank and pipes are not affected 
• In case of malfunction, a large microbiological population can grow in the membranes 
• Medium lifecycle cost  

Ultrafiltration water filtration systems are used in the Grundfos AQpure automated water treatment system and the Grundfos BioBooster wastewater treatment system.