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Reverse Osmosis (Dragon's Den)

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Lorcan | 16:59 Sun 30th Dec 2007 | Science
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A few weeks back there was a reverse osmosis water filter on Dragon's Den. Would reverse osmosis render sea water drinkable?
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It's the preferred method of desalination in many locations. It does require a lot energy and the filtration membranes are quite expensive, but for areas such as Saudi Arabia, where cost is not much of an objection, it works very well...
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I also saw that item on Dragons Den which received support from the 5 millionairres one of which brought up the replacement of the membrane every year. The water container looked similar to that used by caravanners when collecting water from a standpipe and rolling it back to the caravan but in this case from a dirty waterhole.

If these filtration membranes are very expensive as sugested by Clanad its difficult seeing this idea take off?

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