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Types of Water Purifiers
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Water Purifier Types !Reverse Osmosis (RO)
Ultra Violate (UV)
Ultra Filtration (UF)
Activated Carbon
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How RO works ?Uses membranes to
purify water.
High pressure pump to increase the pressure to force the water across membrane.
Remove the minutest of impurities such as arsenic, nitrates, sodium.
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For what type of waterRO purifier suitable
For heavily salinated, hard water RO purifier is best suitable .
Underground has a higher concentration of TDS(total dissolved salts) it is advisable to install an RO-based water purifier.
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Reverse Osmosis (RO)Disadvantages
Not effective as the ultraviolet filters against bacteria and viruses.
Lots of wastage water produced.
On breakage of membrane impurities and bacterial can easily pass through it.
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How UV works ?Uses UV radiation.
UV radiation to deactivate bacteria, virus, disease-causing organisms
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For what type of waterUV purifier suitable
Lakes, rivers, and harvested rain water has a lower concentration of TDS.
For these type of water UV-based purifier is
recommended.
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Ultraviolet (UV) Disadvantages
Little use in eliminating other contaminants in water such as chlorine, heavy metals
Water being treated must be free of color and muddiness.
Kills all germs including viruses, but their bodies remain in the water
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How UF works ?Ultra filtration uses
hollow fibers of membrane.
Water passes though the hollow fibers .
Suspended solids and solutes of high molecular weight are retained in fibers.
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For what type of waterUF purifier suitable
If dissolved salts is limited in treated water public supply water or well, pond, river and rain harvested waters.
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UF disadvantages !Not remove dissolved
solids in water.
Effective when preceded by carbon adsorption or when combined with other purification methods.
To maintain a high pressure water flow, regular cleaning is required.
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How Activated Carbon works ?
Activated Carbon is a natural material derived from coal, wood, coconut shell etc.
Dissolved chemicals in water flowing over the carbon surface “stick” to the carbon in a thin film while the water passes on.
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For what type of waterActivated Carbon purifier
suitable
Activated carbon not effective on hard ground water.
Activated carbon best suitable for lake, municipal supply water on least cost.
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Activated Carbon purifier advantages
It can also reduce the quantity of lead, dissolved radon, and harmless taste- and odor-causing compounds.
It can also reduce the quantity of lead, dissolved radon, and harmless taste- and odor-causing compounds.
least expensive
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Activated Carbon filterdisadvantages
Not effective on bacteria, virus.
Not successful at removing dissolved contaminants or metals such as minerals/salts
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RO, UV, Activated Carbon purifiers
Side by side comparisonReverse Osmosis
(RO)
Ultraviolet(UV)
Ultra Filtration
(UF)
Activated Caron
Electricity Required Required Not required
Not required
Effectiveness
on hard water
Effective
Not effective
Not effective
Not effective
Effectiveness on
bacteria, virus
Moderate
Effective Effective Effective
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ConclusionSelection of water
purifier depends on the water hardness and contamination level.
Water filter used in combination with other type filters, will yield better results than when used individually.
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