Oil-filter Specialist's
Page 23
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A.R.P. Water Purifier
The"Metafilter" Which Delivers Sterile Water Without Subjecting it to • Chemical Treatment
FOLLOWING upon an article about 1water filtration as an air-raid precaution, that appeared in our issue dated August 24 last, comes news from the Metafiltration Co., Ltd., Belgrave Works, Hounslow, Middlesex, of this concern's apparatus for purifying water for drinking purposes. Metafilters are well known to many of our readers in connection with lubricating-oil reclamation, so special interest attaches to this water filter.
A somewhat different principle is employed in the latter from that on which the former operates. Instead -.A columns of discs of filtering material, through which the filtrate actually passes, there are stacks of rings which form a basis for the filter bed, the last named being formed by a substance introduced into the water for that purpose and deposited upon them.
For sterilization, a special filtering medium is employed, and there is ample evidence available to show that the bacterial purity of the water, after filtration by this means, is of an extremely high standard.
Among the advantages claimed for the Metafilter are that its output is rapid, the water running freely, so that the •need for storage, with risk of subsequent recontamination is eliminated; that there is no need for chemical treatment, which may impart a slight taste or odour, and that the apparatus is simple and robust and can be operated by anyone, there being practically no possibility of its functioning incorrectly.
Unsuspected cracks, it is stated, cannot develop in the filtering medium, and so lead to the consumption of contaminated water. The apparatus is cheap and easily portable. A model having an output of 15-30 gallons per hour (type DWF/C) complete with pump and six filter beds, costs £7 3s. and weighs 25 lb., the filter measuring 14 ins, high by 4 ins, in diameter. Types are available up to 12,000 g.p.h.
For A.R.P. work a . special portable set is produced, which incorporates a 50-gallon storage tank for the reception of water from any source. Users of Nletafilters include the War Office, the Royal Air Force and the Admiralty.