Technology

CW42® Water Purification System - Technology Overview

CW42® delivers healthy, clean and pure water from any fresh water source. It removes or controls the levels of bacteria, dangerous metals and chemicals and gives you drinking water better than the quality standards set by the World Health Organisation (WHO).

Schematic Diagram

CW42® - Stages of Filtration

1. Pre-filter.
Removes particles such as sand, rust and algae etc. from water to a predefined size, e.g. 5µm. In situations where the water is not extremely dirty, a low capacity disc pre-filter in the bottom of the OSC cartridge is sufficient. In areas where very dirty water is to be processed a separate pre-filter before the CW42® is desirable.

2. Redox alloy.
The patented redox alloy is composed of copper and zinc. It removes chlorine, heavy metals etc. from waterin exchange for zinc ions. It also causes iron and aliuminium to precipitate. Once in suspension the ceramic filter removes these metals. (This is one example of the importance of the order of the components in the CW42®).

3. OSC
Our patented carbon filter; maximum adsorption of metals and minimal adsorption of trace elements. The adsorbed metals inhibit bacterial colonisation of the carbon and the absence of chlorine assured by the preceding redox alloy assures that no metals will be displaced.

4. Ceramic filter.
This is a silvered ceramic mechanical filter rated at 0.3 µm. It removes all pathogenic bacteria and all protozoan cysts (such as Cryptosporidium). Other small particulates (such as suspended iron and aliuminium) are also removed. The ceramic is designed to be user cleanable if necessary.

5. Solid block carbon filter.
This is activated carbon extruded into a cylinder to minimise the effects of "channelling". It is designed to remove organic contamination from water. There is no possibility of colonisation by pathogenic bacteria because it is protected by the ceramic element and there is no possibility of the re-release of organics because of the absence of chlorine and metals at this stage.


The CW42® technology

The CW42® uses a mixture of new and existing technology to produce top quality drinking water. This design is not intended to produce ultra pure water. In all other filters that utilise ceramic filters these have to be put before the other active stages to avoid bacterial colonisation of the system. Uniquely, the design of the CW42® allows us to put the ceramic downstream of the redox alloy giving greatly enhanced removal of some precipitates. No other water purification system has the same performance in removing bacteria, metals and chemicals for the price of the CW42®.