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how to select which water purifier is right for you

21 Apr 2020

While deciding which water purifier to purchase, the primary factor to keep in mind is the type of water you are going to filter out. There may be many features and post-sales services endorsed in a water purifier model available in market, but the type of water purification technology to choose is what needs to be settled first.

To give you a little recap, here below we have listed everything you need to know about types of water purifiers; the features and differences between various technologies used in them.

Features RO Purifier UV Purifier UF Purifier Gravity Purifier
Technology Uses a semi-permeable membrane to pass water through. May use activated carbon to remove bad odour and chlorine. UV lamp generates ultraviolet rays which disables DNA of microbes. No chemicals used. Uses a membrane similar to RO, but with larger pores. No chemicals used. Passes water through sedimentary filters under gravity and water pressure. May use activated carbon to remove bad odour and chlorine and other chemicals for disinfection.
Power consumption Uses electricity to pump water through membrane. Uses electricity to power UV lamp. Doesn’t use electricity. Doesn’t use electricity.
Removal of TDS Removes all heavy metals, chemicals and pesticides. Effective on hard water; high TDS. Doesn’t remove mud, dirt, and microbes. Ineffective on hard water; high TDS. Successfully removes mud, dirt, and microbes. Ineffective on hard water; high TDS. Removes all heavy metals and dirt. Ineffective on hard water; high TDS.
Removal of Pathogens Effective in eliminating larger-sized pathogens; smaller microbes may pass through. Disables all living pathogens but leaves behind their dead bodies. Filters out all pathogens but leaves behind no dead bodies. Ineffective on smaller microbes that may pass through.
Waste water 75% of water rejected. No water rejection. No water rejection. No water rejection.
Best used for Underground water with high TDS. Clear water with low TDS from municipal corporations. Unclear water with lesser TDS from municipal corporations. Unclear water with lesser TDS.
Maintenance Low maintenance. Parts easily available in market. Low maintenance. High manual maintenance required to flush out the drained waste collected. Moderate assisted maintenance required to flush out the drained waste collected.
Life Change the membranes every 6 months. System works for 5-8 years. Change the lamps every 1 year. System works 5-8 years Clean the filters every week. System works for 10 years. Change the filter cartridges every 6 months. System works for 3-5 years.

How to choose water purification systems most appropriate for your needs?

Firstly you need to check the TDS level i.e. total dissolved salts present in the water supplied to your homes. Most water purifier sale representatives can help you with that.

  • If your home receives water from bore wells or hard water supplies, go for RO technology. RO purifiers are also affective in removing pesticides and metals like lead and arsenic in polluted waters, and small levels of pathogens from the water. If the level of disease causing pathogens is high in water, club RO with UV or UF technologies.
  • If you receive clean water supplied from municipal corporations with low TDS, UV filters can help kill all viruses, protozoa and bacteria present in the water.
  • If the water supplied to your homes is low in TDS but inefficient pipelines allow mixing of mud and silt into the water, UF filters is best for moderately clean water. They remove all dirt, metals as well as pathogenic bodies from the water. It is also a good choice for those who face shortage of power supplies, since UF technology doesn’t run of electricity.
  • UV and UF technologies don’t affect the pH balance of the water. This is only beneficial when hard water is not being treated. RO purifiers can balance the taste of had water and make it softer and sweeter.
  • If your water is very low on TDS and not heavily contaminated with germs, you can use gravity filters. They don’t use electricity to run, or waste water unnecessarily, and use mild chemicals to remove odour and germs for the water (depending upon advancement of model).

Tips to choose the best water filter for your homes

  • Be sure to check if your water purifier model has a TDS controller. Many times processes like RO can remove essential nutrients like calcium and magnesium from the water in an attempt to remove salts from the clean water, when the system is set to treat high TDS water.
  • Advance models of RO systems do come with minerals which can add essential minerals back into the water.
  • Going in for multistage or combination models such as RO+UV+UF simply because you believe that more is better (which is a myth) is not only wastage of your hard earned money, but also promotes huge wastage of water, when it is simply not required. If your supplied water is low in TDS, there is no need to use RO; rather UF+UV can take care of your needs, without producing any waste water.
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