The Technology

How does it work?

The Sydney 905 filters prove to be one of the fastest, easiest, highly effective and most cost efficient ways to get safe water regardless of water source. 

These water filters use hollow fibre (Polysulfone) membranes.

 Both the filter and the purifier (i.e. collectively referred to as filters) have microscopic pores blocking any particles bigger than their respective micron ratings and they have “ion- exchange” capabilities. This means that the filters also have what we call an “ion-exchange” impact on the ions of various elements in water such as chlorine, sulphides etc. This impact is brought about by the natural electric or static charge that is created between the polyolefin/polysulfone fibres of the membrane inside the filters. This ion-exchange will positively reduce chlorine and even some metals and chemicals in the water by altering their respective ions thus further improving on the quality of the water.

There are two types of filters available for sale/distribution:

  • With the 1 micron absolute pore size filter, it is impossible for any bacteria, protozoa or cysts to pass through this microfiltration filter. This is the company’s standard filter. It has been tested by WHO (Testing Reference: 24/1/2020-R3-17). Membrane area is 0.5m² (nominal value).  

As the pores of the membranes within the Sydney 905 Filter are 0.1 microns in size, this means 700 pores can fit, side by side, in a width of a single human hair or approximately 10 000 will fit into a millimeter.

  • If viruses are an issue, then with the 0.01 micron absolute pore size purifier, it is impossible for viruses in addition to bacteria, protozoa and cysts to pass through this ultrafiltration purifier. This purifier is known to block even the smallest know virus to man which is the MS2 It has been tested by WHO (Testing Reference: 24/1/2020-R3-18). Membrane area is 0.61m² (nominal value).

As the pores of the membranes within the Sydney 905 Purifier are 0.01 microns in size, this means 7000 pores can fit, side by side, in a width of a single human hair or approximately 100 000 will fit into a millimeter.

Table 1: Microbiological Contamination Removal Rates  (click table to enlarge)

Both the 0.1 micron Sydney 905 Filters (WHO testing reference 24/1/2020-R3-17) and the 0.01 micron Sydney 905 Purifiers (WHO testing reference 24/1/2020-R3-18) have been stringently tested and evaluated (T&E) under “Round III of the World Health Organization (WHO) International Scheme to Evaluate Household Water Treatment Technologies”.

The testing followed the requirements of the WHO protocol for filtration technologies and the evaluation is based on performance criteria set out in “Evaluating Household Water Treatment Options: Health-based targets and microbiological performance specifications” (WHO, 2011).

WHO allowable reduction target for “Targetted Protection” against bacteria and other protozoa is a reduction of ≥ 2 log 10. This equates to a 99.0 % reduction rate of bacteria and other protozoa. 2 log reduction means that the number of potentially harmful microbiological “Colony Forming Units”(CFUs) is 100 times smaller in a particular test area.

The 0.1 micron Sydney 905 Filters obtained and an incredible average ≥ 7.1 log 10 reduction in bacteria and other protozoa. This equates to more than a 99.99999 % reduction rate of bacteria and other protozoa. 7 log reduction means that the number of potentially harmful microbiological “Colony Forming Units”(CFUs) is 10 000 000 times smaller in a particular test area.

The 0.1 micron Sydney 905 Filters far exceeded WHO’s allowable reduction performance targets for targetted bacteria and other protozoa.

The testing of the 0.01 micron Sydney 905 Purifier followed the requirements of the WHO protocol for filtration technologies and investigated the purifiers abilities to reduce bacteria (Escherichia coli – E. coli), protozoa and viruses (coliphages MS-2 and phiX-174) in microbiological challenge water. The overall challenge water was made up of “General Test Water” (GTW) which simulates high quality ground water and “Challenge Test Water” (CTW) which simulates surface water.

The WHO allowable reduction target for “Comprehensive Protection” against bacteria and other protozoa is a reduction of ≥ 2 log 10 (See above mention of 99.0 % CFU reduction within a test area).

The 0.01 micron Sydney 905 Purifiers obtained and an incredible average ≥ 7.3 log 10 reduction in bacteria and other protozoa. This equates to more than a 99.99999 % reduction rate of bacteria and other protozoa. 7 log reduction means that the number of potentially harmful microbiological “Colony Forming Units”(CFUs) is 10 000 000 times smaller in a particular test area.

The WHO allowable reduction target for “Comprehensive Protection” against viruses is a reduction of ≥ 3 log 10. This equates to a 99.9 % reduction rate of viruses. 3 log reduction means that the number of potentially harmful microbiological “Colony Forming Units”(CFUs) is 1000 times smaller in a particular test area.

The 0.01 micron Sydney 905 Purifiers obtained and an overall average ≥ 5.3 log 10 reduction in viruses (i.e. average ≥ 5.5 log 10 for MS-2 and an average ≥ 5.1 log 10 for phiX-174). This equates to more than a 99.999 % reduction rate of viruses. 5 log reduction means that the number of potentially harmful microbiological “Colony Forming Units”(CFUs) is 100 000 times smaller in a particular test area.

This far exceeded WHO’s allowable reduction performance targets for bacteria, protozoa and viruses in order to provide “Comprehensive Protection”.

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