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Filtration Media

GRANULATED ACTIVATED CARBON – for reduction of chemicals and chlorine

Grade YAO 12 x 20. Coconut shell based. Surface area 1250m2/g/ Silver impregnated at 0.1% to allow controlled silver release and thus to maintain bacteriostatis throughout filter life.

Activated carbons convert chlorine to chloride, which, at the concentrations found in drinking water, will be totally non-toxic and undetectable to taste. Activated carbons are the preferred technology for the adsorption of organic molecules and effectively deal with those contaminants that give rise to problems of colour, odour and taste as well as a wide spectrum of micro-pollutants such as industrial solvents, pesticides and biological break-down products eg amines etc.


REDOX ALLOY- to reduce heavy metals, often effective against nitrates and fluoride too

Alloy of high purity electrolytic copper and zinc. Colour gold. Form granulated. Apparent density 2.6 gm/cc. This alloy has a reduction/oxidation (redox) potential of contaminants and allows spontaneous redox reactions of contaminants to occur in a fluid medium,  ie. electrons are transferred between the redox alloy and the contaminant. When a metallic contaminant is present in the influent water, an electrical potential is created between itself and the copper/zinc alloy. The further apart in the electromotive force series metals are, the greater the differences in electrical potential, and thus the greater the rate of corrosion. (The redox alloy exploits corrosion principles). The contaminant metallic ion is effectively removed by electroplating itself against the redox alloy, in exchange for copper or zinc. The release of copper and zinc falls well within the relevant EEC limits for potable water.

Due to its strong redox potential, the redox alloy effectively kills algae and fungi and will control bacterial growth (especially during standstill periods when conditions for bacterial growth are most favourable). It complements and enhances the properties of carbon when used in conjunction with GAC.


HEXAMETAPHOSPHATE - to inhibit limescale formation

Hexametaphosphate crystals dissolve at a controlled rate into the influent water keeping 'hard' water salts in solution and thus preventing them depositing on metallic surfaces as limescale. The hexametaphosphate forms a protective coating on the exposed metallic surfaces. In preference to the calcium and magnesium salts it is holding in solution, and because it will not accrete upon itself, any build up which could block or obstruct pipes is prevented. The coating on the metallic surfaces effectively prevents dissolved oxygen from coming in contact with the metallic surfaces and thus prevents corrosion.
Special media are also utilised as necessary.