We aim to help explain and demystify industry terms to help you better understand LIFESAVER technology.
What is Log Reduction?
Log Reduction is the level at which viruses, bacteria and cysts are removed from a water source after filtration. As the log value increases so does the quantity of microbiological pathogen removed the water source. The higher the logarithmic value, the more effective the water filter is in removing microbiological pathogens from water. LIFESAVER water filters meet an adaption of NSF Protocol 231 based on recommendations of the U.S. Environmental Protection Agency (EPA). LIFESAVER technology filter out a minimum 99.99% of Viruses (Log 4), 99.9999% of Bacteria (Log 6) and 99.9% of Cysts (Log 3).
Why is Log Reduction the measure?
We believe it to be the most accurate and relevant measurement of water filtration effectiveness. Log reduction represents an acceptable range of microbiological pathogen removal.
If a hollow fibre membrane specifies a pore size (micron/nanometer), typically 95% of the time the actual pores will be within a very tight range around this specified pore size, there will be some pores that are bigger and some that are smaller. This is because membrane manufacturers cannot specify an exact uniform pore size across all of their membranes due to variance which occurs in membrane production.
It is for this reason that Icon Lifesaver do not quote a specific micron/nanometre figure. The membranes used in our products have a spread of pore sizes that ensure the stated reductions are achieved.
What is Ultra Filtration?
Ultra Filtration is the process of removing waterborne pathogens from water by the use of a physical barrier and applied pressure. It is a separation process using membranes with varying pore sizes. Suspended solids and solutes of high molecule weight are retained dependant on the specifications.
How can clean water be defined?
The 1987 EPA Guide standard and protocol for testing microbiological water purifiers set clean water targets for waterborne pathogens removal figures. For water to be deemed 'clean' it has to meet the following parameters:
Bacteria - Log 6 (99.999% removal)
Viruses - Log 4 (99.99% removal)
Cysts - Log 3 (99.9% removal)
National Sanitation Foundation. The NSF are an independent, accredited organisation. Manufacturers, regulators and consumers look to NSF International for the development of public health standards and certification programs that help protect the worlds water, food consumer products and environment. As the gold standard for objectively comparing drinking water systems NSF base their testing parameters on the standard set out by the Environmental Protection Agency (EPA).
Environmental Protection Agency.
What is the difference between microbiological filtration and carbon filtration?
Microbiological filtration is the process of filtering microbiological pathogens from contaminated water sources, such as viruses, bacteria, cysts and parasites.
Carbon Filtration through an carbon block will improves the palatability of water by removing chlorine, taste, smell and odour.