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There is a UK product called the Aquafilter used for fairly small scale projects (about 60 litre/hour) originally developed for disaster releif but also used as permanent supplies. The web site www.grifaid.org has details, they dont quote a cost per unit but probably a few hundred UK pounds per unit, a working life of 6 years is quoted. The product is often distributed by charities as part of an aid package for disaster releif.