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Overview

Water contamination is one of the biggest problems in India. Drinking untreated water is a cause of various diseases. To combat this problem many companies have come up with water purifiers. They are cheaper than bottled water and effective than boiled water.

Since water purifier is an essential item in the household we bring you some guidelines that will help you make the optimum choice.

Types of Filters

  1. Activated Carbon

This filter has carbon granules which are positively charged and infused with silver molecules. This means they can purify soluble gasses such as chlorine, carbon monoxide, nitrogen, ammonia and organic material like dead algae, leaves or any other dead thing washed into a water body. The porous nature of the carbon (charcoal) helps to absorb chlorine and pollutants such as pesticides and herbicides. The filters are rated on the basis of the size of particles, measured in microns, they can remove. So if a filter measures 0.5 microns is better than the one that measures 10 microns. The best thing about them is that they are inexpensive and they even come in smaller sizes which can be directly fitted to taps. As they don’t need electricity to work on, you save on electricity as well.

Price: Rs. 1,800 to Rs. 3,500

  1. Ultraviolet Filters

These filters use UV radiation to neutralize waterborne disease by passing a minimum level radiation on water and attacking DNA in cells. This filter is effective in removing pathogens and removes up to 99% pesticides. They are not effective in removing chemicals like arsenic, nitrate, and iron; taste, smell, suspended particles and color. They can filter up to 2000 liters per day.

Price: Rs. 3,000 to Rs. 10,000

  1. Reverse Osmosis Filters

Reverse Osmosis (RO) system consists of multi-stage filtration of water, a combination of active carbon and also particle filtration. In this process, the tap water passes through a membrane (a polymer film) that has very small-sized pores and this clears out minerals and microorganisms. The impurities collected are flushed out by an outlet pipe. An RO water purifier improves the taste of water but, it is difficult to say that the water will be 100 percent safe as at times due to perforations (because of wear-and-tear or due to manufacturing defect) in the filter, some organic impurities can get through the filter. RO filters are recommended at places where the water contains a high amount of dissolved minerals. The disadvantage of an RO purifier is that there may be chances that the membranes in these filters drain out little amounts of the necessary minerals too. Also, it requires a continuous water supply to fulfill the purpose and can be fixed to only one tap.

Price: Rs. 9,000 to Rs. 22,000

The filter you buy entirely depends on quality of water supplied to your home. There are many labs in the city that can help you test the water supplied in your area. Once you have determined which filter to install, purchasing a water purifier becomes easy.

Other Factors to Consider

  1. Water QualityThe quality of water you receive in your locality determines the type of filter that needs to be installed. Just in case, if you reside in an area where the water is heavily alkaline, hard or underground water is supplied, you must opt for RO purifier. This technology is relatively new but immensely popular. It is efficient in removing minutest of impurities as the membrane used measure barely 0.0005 microns. It removes the taste of foreign particles present. If the taste is not the criteria, then go for activated carbon or UV water purifier.
  2. ElectricityRO water purifiers consume a lot of energy. So if you are staying in an area where the power supply is erratic then this is not a choice. Also, if you frequently move from one place to another than activated carbon water purifier is suitable, as it is compact in size and works without electric supply.
  3. Storage – This is the only factor where UV purifier triumphs over activated carbon and RO systems. RO system stores the purified water in a container and has auto power cut-off.

Keeping these few things in mind will make shopping for water purifiers simple and cost efficient.

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