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Seccua Home Solutions

Seccua Brochure including all information you need to select the right water treatment technology for your home

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Water Treatment 101<br />

Media-filtration and Adsorption<br />

What is media-filtration?<br />

„Media-filtration“ describes filtration of water through<br />

any bulk material. On its way through that material,<br />

water contaminants are removed either by getting<br />

stuck between the particles of the media or by being<br />

adsorbed - or attached - to the surface of the media.<br />

Media filters need to be either backwashed with filtered<br />

water to remove the particles that got stuck in<br />

between the media or regenerated or exchanged in<br />

case the media adsorbed contaminants from water.<br />

Pros and cons of media-filtration<br />

For simple media-filtration, often sand is used to remove<br />

particles from water, travelling through the filter.<br />

Sand is cheap, nonetheless sand does not provide<br />

for a defined removal performance of the filter. Furthermore,<br />

water contaminants can break through a<br />

media filter, if not designed or maintained properly.<br />

Therefor regular media-filtration cannot be used for<br />

removal of bacteria or parasites.<br />

The use of adsorption<br />

Adsorption happens between very small particles,<br />

dissolved in water, such as e.g. Pesticides or endocrine<br />

disruptors, and very large surfaces, like provided<br />

by granular activated carbon (GAC): One gram<br />

of activated carbon holds a surface of 32,000 sq. ft<br />

(3,000 m 2 ).<br />

Once attached, those small contaminants will remain<br />

on the surface and will not re-dissolve into water.<br />

Depending on the concentration of contaminants in<br />

the feed, GAC gets loaded over time and needs to<br />

be replaced.<br />

GAC has the capability to remove the following contaminants<br />

from water<br />

• Pesticides, Biocides<br />

• Selected residuals of pharmaceuticals<br />

• Color<br />

• Taste & odour, if caused by organic matter<br />

Like every other media, also GAC offers bacteria<br />

good conditions for breeding. Therefor a downstream<br />

filtration, strong enough to provide for a high grade of<br />

bacterial removal, should be installed.<br />

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