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Model SWP is designed to meet specific requirement for treatment of water in emergency or survival conditions. Using the proven filtration and sterilisation system of Pre-Mac's highly successful PWP, Model SWP will provide safe drinking from contaminated sources. Size and weight have been kept to a minimum for inclusion in emergency ration packs.
In operation the source water is initially filtered, cleaning the water as well as chemical contamination. This is followed by disinfection using an iodine-resin complex which acts as a contact microbiocide but also releases a low level of iodine into the water for secondary disinfection. Secondary disinfection occurs during the recommended holding period.
The SWP is convenient to use and will not block due to its high filtration capability and in-built pump. The rated capacity of SWP is 50
-60 litres, at which point it should be discarded.
The effectiveness of SWP has been proven in tests carried out by the London School of Hygiene and Tropical Medicine. In these tests total elimination of the bacteria Escherichia coli at 108.4 per litre was recorded whilst reductions of Poliovirus in excess of 99.9%, with a holding time of 2 minutes, were recorded. This effectiveness is maintained throughout the stated treatment capacity of 50
-60 litres.
Tests carried out by the RAF Institue of Pathology and Tropical Medicine complete effectiveness against different genera of bacteria. This effectiveness was also shown to be maintained at twice the nominal capacity, i.e. SWP was still effective after treating with 100 litres of water. It was concluded that SWP could be used in field conditions with confidence. |
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Registered in England No : 1927161 Registered Office : 12 Lonsdale Gardens,
Tunbridge Wells, Kent, TN1 1PA
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