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Reverse osmosis is the key principle behind RO water purifiers. Water from higher TDS (total dissolved solids) level – that is, very hard water – is transferred to the lower TDS level through a filtering membrane. RO technology uses high pressure to push water through an extremely fine filter or membrane. The holes in this membrane are as small as .0001 microns. They remove dissolved salts along with pollutants and other physical contaminants including virus, and harmful metals, minerals, bacteria and microorganisms. Most of the RO purifiers also comprise of TDS controllers (to adjust the TDS level). The filter is kept clean by flushing the separated contaminants so they drain away.

In the quest to live healthier lives, many people have turned to water filters. Some water filters fit into pitchers to provide clean drinking water. Some filters attach to faucets and filter water as it flows out of the tap, and still others filter water as it enters a house so that all of the water in the home is filtered.


What you need to know before buying a water purifier

Water being the most vital element of our life, its purity should be accorded the highest priority by each of us. Water is our Life Line. Many diseases in the third world are either water-borne or due to contaminated water. Unlike the western countries where tap water is safe for drinking, the water that comes through taps in the developing world...

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Design

Purification Type
EAT Filter

The revolutionary 'EAT Filter' with the unique Electro Adsorption technology (EAT) has positively charged iso nano fibres with powdered activated carbon that gives you the power & benefits of 4 filters in one physical filter.

HD Green RO

The new space-age high definition Green RO membrane of Dr. Aquaguard Magna is designed for superior performance to ensure high water recovery and retention of natural minerals. Unique Green RO technology membrane removes excess TDS, blocks dissolved impurities and chemical contaminants, while retaining essential minerals in the drinking water.

HD RO

The new space-age high definition RO membrane of Dr. Aquaguard Magna is designed for superior performance to ensure high water recovery and retention of natural minerals. Unique RO technology membrane removes excess TDS, blocks dissolved impurities and chemical contaminants, while retaining essential minerals in the drinking water

NXT HD RO

The new space-age high definition RO membrane of Dr. Aquaguard Magna is designed for superior performance to ensure high water recovery and retention of natural minerals. Unique RO technology membrane removes excess TDS, blocks dissolved impurities and chemical contaminants, while retaining essential minerals in the drinking water.

NXT HD RO Water Purifier comes with NextGen LED Display, Intelligent Alert Interface

RO

Reverse Osmosis

RO+UF

Reverse Osmosis & Ultra Filtration

RO + SCMT

Silver chraged membrane technology

UF

Ultra Filtration

UV

Ultra Violet

UV+RO

Ultra Violet & Reverse Osmosis

UV+RO+UF

Ultra Violet, Reverse Osmosis & Ultra Filtration

UV+RO+UF+Minerals

Ultra Violet, Reverse Osmosis, Ultra Filtration & Minerals

UV+UF

Ultra Violet & Ultra Filtration


Purification

Recommended for
High TDS (Borewells)

Water sourced from borewells with high TDS (Salty/Khaara/Brackish Water)

Low TDS (Rivers, Lakes)

Water from rivers & lakes having low TDS, which does not taste salty. Municipal/Corporation/Sweet tasting water

Filter Cartridges
Biotron Cartridge

It magnetizes water and de-culsters water molecules to make the water more "bio-available" by unlocking the nutrients in water, promising you the healthiest water.

EMLE

Prevents scaling of dissolved salts on the surface of the membrane and hence enhance both membrane life and performance.

HCCB (Hybrid Carbon Chemi Block) Cartridge

Removes excess chlorine, bad odour, colour, and organic impurities. Also eliminates new age contaminants like heavy metals, chemicals and pesticides.

HD Filter Cartridge

Removes fine particles like dust, dirt, mud and sand.

Mineral Cartridge

Enhances the taste of water by removing dissolved gases like VOCs. It also increases calcium and Magnesium levels in water to balance pH.

Post-Carbon Sediment Filter

Removes remaining fine and coarse particulate impurities/dirt and improves life of RO Membrane.

Post-RO Carbon Filter

Last level of purification acts like a polisher and enhances the taste of purified water.

Pre-RO Carbon Filter

Removes chlorine and organic impurities like harmful pesticides. It also adsorbs bad taste and odour-causing organic compounds from water.

Pre-Sediment filter

Pre-Sediment Filter for Heavy Sediment and Particulates (Dirt, Rust, Sand, Silt). It removes fine and coarse particulate impurities and improves life of the Carbon Filter.

RO Membrane

Unique RO technology membrane removes excess TDS, blocks dissolved impurities and chemical contaminants, while retaining essential minerals in the drinking water. It also helps removing dissolved salts, hardness, pesticides and heavy metals like arsenic, lead and mercury.

UV reactor

Acts as an additional stage of purification to further inactivate bacteria, virus and parasites to deliver safe water.


Toxic Metals/Materials

The Bureau of Indian Standards (BIS) has specified requirements for removal/reduction ofheavy metals in IS:16240. We tested the 10 brands for presence of the following heavy metals:

Arsenic: As many as six brands – Tata Swach, Zero B, Kent, Aquaguard, Electrolux and Usha – did not meet the requirement (a maximum 0.01 mg/l).

Copper: None of the brands met the requirement set by Indian Standard (0.05 mg/l).

Mercuy: All the brands more or less met the specified requirement – minor deviations were observed in Pureit, Aquaguard and Usha.

Cadmium: Minor deviation was observed in one brand, Pureit. All other brands met the standard requirement.

Iron: All the brands met the requirements, with the exception of deviation in two brands, Whirlpool and Usha.

Lead and chromium: All brands met the requirements.


Microbiological Activity

The presence of bacteria and pathogenic (disease causing) organisms is a concern when considering the safety of drinking water. Pathogenic organisms can cause intestinal infections, dysentery, hepatitis, typhoid fever, cholera and other illnesses. As per the BIS requirement, the RO purifier shall inactivate/kill the selected standard challenging organism E. coli.


Manufacturers’ Comments

Pureit - All Pureit devices comply with the US EPA norm for 6, 4, 3 log reduction for bacteria, virus and cyst. We have supporting test reports from reputed internationally accredited labs to support this. We propose the following steps: Please repeat the test done on fresh devices. a) Please test in triplicates and not just a single device. b) The model you have tested was a recommendation of June 2014. We have discontinued that product. We suggest you test Pureit Marvella RO+UV SKU. c) To avoid any contamination during set-up and installation, please get the same done by an authorised Pureit technician only. d) Get the tests done again in some other authorised and approved lab.

Aquaguard Enhance RO - Our major concern is the test result for microbial performance.Our RO system can remove bacteria and virus effectively because of the mechanical separation. Membrane porosity is less than 0.0001 micron, which is much less than the bacteria and virus cell size (bacteria 0.2 micron and virus 0.01 micron). Also, it can separate the ionic-level chemicals, which are much smaller than bacteria and virus. We suggest that you check the microbial study again by means of proper chlorine tablet disinfection of the storage tank of the new unit.

Aquaguard - Our major concern is the test result for microbial performance. Our RO system can remove bacteria and virus effectively because of the mechanical separation. Membrane porosity is less than 0.0001 micron, which is much less than the bacteria and virus cell size (bacteria 0.2 micron and virus 0.01 micron). Also, it can separate the ionic-level chemicals, which are much smaller than bacteria and virus. We suggest that you check the microbial study again by means of proper chlorine tablet disinfection of the storage tank of the new unit.

Tata Swach a) Arsenic: Reduction observed as per the Consumer Voice test is be in range of 56 per cent–59 per cent. However, in the tests as per NSF certification and in our own tests, the membrane/unit has demonstrated more that 90 per cent reduction consistently. b) Copper: Reduction in first week is surprisingly low and then there is drastic improvement. c) Mercury and cadmium: Reduction results show a trend opposite to that for copper.

Zero B - a) Total dissolved salts: The unit was tested at an inlet TDS level of 1,976 ppm. However, the limit for inlet TDS level for Zero B Wave purifier is 1,500 ppm. The same should be taken for testing the TDS reduction of the product (with reference to IS 16240: 2015). b) Hardness: The inlet water hardness level is 500 ppm for Zero B Wave. The unit was challenged for a hardness level of 2,000 ppm, which exceeds the inlet water limits by a big margin. c) Chlorine: The level of chlorine spiked in test water was 8.7 ppm, whereas the inlet chlorine level for the product is nil. It does not claim to remove any chlorine from the treated water. d) Toxic chemicals: We are surprised that Zero B Wave has not performed well for arsenic and copper removal from the water, though our in-house test results are satisfactory. e) Microbial reduction: We are surprised that the results are contrary to our in-house test results.


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