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Date:         Fri, 3 Jan 2003 14:54:15 -0800
Reply-To:     pensioner <al_knoll@PACBELL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         pensioner <al_knoll@PACBELL.NET>
Subject:      Water Filtration vs Water Purification
In-Reply-To:  <200212301913.gBUJDNpd012530@mtaw2.prodigy.net>
Content-type: text/plain; charset=iso-8859-1

Two different processes. The ceramic Katadyn filter mechanically removes particulates much like a sieve or strainer removes tomato seeds from the tomato pulp. This is filtration. Can't handle viri as the partical size is so small that the flow characteristics would be abysmal. Can handle most bacteria and cysts.

The iodine mesh systems like the PUR purifiers expose the liquid to iodine as it is pumped through the mesh. Will handle viri, bacteria. Cysts are an issue because of the exposure time. Some cysts are tough enough to not be destroyed in the short time they are exposed to iodine. It is not as fine a filter as the ceramics and is susceptible to clogging as its surface is not easily cleaned.

Filtration or purification of muddy water can be aided by a settling process or using a paper coffee filter to eliminate many of the larger particles.

Neither system will remove dissolved contaminants.

A solar 'still will get all the evil out, including dissolved contaminants.

A surface filter like finely divided charcoal will remove some contaminants but not bacteria or viri. It will make the water taste better.

The gravity fed Katadyn ceramic system is quite good and lets gravity do the work. It is of course bulkier than the "pocket" filters, but hey, that's why you own the vanagon, so you have a home for all the niftyneato accoutrements.

pensioner


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