Question 1

What is an RO Water Purifier?

Accepted Answer

An RO water purification system or Reverse Osmosis contains a semi-permeable membrane that reduces Total Dissolved Solids (TDS) from water along with several other impurities like Bacteria, Viruses, heavy metals, chemicals, and other impurities. As water passes through the semi-permeable membrane, it only allows  water to pass through it, while flushing away the impurities.

Question 2

When should you buy an RO Water Purifier?

Accepted Answer

If your water source has high TDS, i.e. tastes salty, it is recommended to use an RO water purifier. TDS levels upto 500 ppm are considered to give natural or regular taste to water for human consumption. As per BIS, USEPA, and WHO, if the TDS exceeds 2000 ppm, water can be unsafe for consumption as it may contain more sulphate, chlorides, and other chemical impurities. 
 While WHO standards stipulate upto 300 ppm as the ideal TDS level in the water,  However, much depends on the composition of water with respect to the contaminants. 
 For example, suppose the input water source has high arsenic levels, or high iron levels but TDS levels are less than 300 ppm or 500 ppm. Then, you require an RO water purifier to remove these harmful contaminants. 
 Ideally, zero TDS is best for health because it ensures 100% water purity. But 100% pure water does not have any taste. Besides, water is the best way to infuse essential chemicals like magnesium, and calcium. Therefore, the WHO has stipulated TDS levels up to 300 ppm as suitable for human consumption.

Question 3

What is the price of an RO water purifier?

Accepted Answer

An RO Water Purifier Price range starts from Rs 9000 and can go up to Rs 26000 depending on the Stages of Filtration and features like Mineral Enrichment, Copper Charge Technology, Filter Alerts etc. When you choose to buy an RO Water Purifier, make sure that your chosen product fulfils all your and your family's needs.

Question 4

How Does Reverse Osmosis Work?

Accepted Answer

A semi-permeable membrane is used in reverse osmosis water purifiers that allows only clean water to pass through. During reverse osmosis, even the tiniest particles or dissolved solids are not allowed to pass through these membranes, thus, making the water healthier and tastier to consume. 
 Reverse Osmosis (RO) — A pressure-driven membrane separation technique to reduce the concentration of dissolved solutes such as minerals, salts and organic species in water. Reverse osmosis uses an applied pressure to drive the transport of water across a semi-permeable membrane from a more concentrated solution (feed) to a more dilute solution (permeate) RO Membrane is aA semi-permeable barrier that allows the preferential passage of water.

Question 5

How much is the Maintenance Cost of RO Purifiers?

Accepted Answer

The annual maintenance of a water purifier is determined by the purifier's kind and filtration technology. The cost of maintaining a RO water purifier varies from Rs. 2500 to Rs. 6000, depending on the water purifier model.

Question 6

How long does the RO membrane last?

Accepted Answer

An RO membrane's normal lifetime ranges from 1.5 to 3 years, depending on the level of TDS in feed water. It is recommended to change the RO membrane in 1 to 2 years if the TDS level of your water source is high.

Question 7

How much time does it take to purify water in Pureit RO purifiers?

Accepted Answer

Pureit Water Purifiers can purify water from 20 to 24 litres per hour, depending on the filtration capacity, that varies from product to product. However, the time taken to purify is influenced by the type of water supply, the longevity of the device’s filters, the input water pressure, and other impurities in the water.

Question 8

What is TDS and What does a TDS Meter Measure?

Accepted Answer

TDS (total dissolved solids) is a measurement which refers to the combined total amount of both inorganic and organic substances dissolved in water. These can be total charged mineral content in water and any neutral (uncharged) compounds such as sugar, alcohol, many organics (including many pesticides and their residues), and unionized forms of silica, ammonia and carbon dioxide. 
 TDS meters measure the conductivity of a water sample, which correlates to the concentration of only charged ions or mineral content. 
 TDS meters typically display the total dissolved solids in parts per million (ppm) or mg per litre. Total charged ions" is likely a much better term for what the TDS meter measures. Fortunately, a measurement of total charged ions is good enough for most purposes. 
 Natural TDS levels can vary based on regional geology but do not necessarily indicate water quality issues. If you have questions on what should be TDS water you consume, we suggest consulting your dietician/doctor

Question 9

What Does a TDS Meter NOT Measure?

Accepted Answer

TDS meters are unable to detect certain contaminants, as they primarily measure the electrical conductivity of water, which reflects the presence of charged ions. Here are some common contaminants that TDS meters cannot detect: 
  Non-ionic Organic Compounds:  TDS meters cannot detect organic substances that are uncharged, such as pesticides, herbicides, pharmaceuticals, and petroleum-based products like gasoline and motor oil. 
  Volatile Organic Compounds (VOCs):  TDS meters are ineffective in detecting VOCs, which are organic compounds that can easily vaporize into the air. VOCs include chemicals like benzene, toluene, and trichloroethylene, often found in industrial solvents and household products. 
  Heavy Metals:  While TDS meters can detect the presence of some heavy metal ions, they may not be sensitive enough to identify toxic levels of specific heavy metals, including lead, mercury, arsenic, cadmium, and chromium 6. 
  Bacteria and Microorganisms:  TDS meters cannot detect the presence of bacteria, viruses, and other microorganisms in water. Specific tests, such as microbial culture or DNA-based methods, are required for their detection. 
  Radioactive Contaminants:  TDS meters cannot identify radioactive substances such as radon, uranium, or radium that may be present in water sources. 
  Dissolved Gases:  TDS meters do not measure the presence of dissolved gases like hydrogen sulfide (producing a "rotten egg" smell) or carbon dioxide. It's important to note that while TDS meters cannot detect these contaminants directly, their presence may affect the overall TDS reading indirectly due to the contribution of charged ions. However, for accurate and comprehensive water testing, specific tests targeting these contaminants should be conducted at BIS approved 3rd party lab.

Question 10

When is a TDS Meter Helpful?

Accepted Answer

TDS meters can be useful in testing the efficiency of certain water filters, such as distillers or reverse osmosis systems, to ensure their core technology is functioning properly. Its useful to broadly compare the purified water and feedwater with respect to their TDS values.  
 While TDS meters are useful for estimating the mineral content in water, they have limitations in detecting specific contaminants. They should be considered as screening tools rather than comprehensive water testing devices. To ensure water safety, comprehensive water testing through certified laboratories or consulting water quality experts is recommended.

Question 11

How Do TDS Meters Work?

Accepted Answer

TDS meters measure the electrical conductivity of water. Dissolved salts that dissociate into charged ions carry an electrical charge, conductivity of these charged ions is directly measured by the probe or electrode of TDS meter, and it is then converted into the TDS value in ppm (part per million or mg/Ltr.) and is seen on the display. 
  Factors Affecting TDS Measurements:  TDS measurements can be influenced by factors such as temperature, pH, and the presence of air bubbles in between the electrodes, and dissolved gases in water. Understanding these factors helps interpret TDS measurements accurately.

Question 12

Why do I experience different readings in the same water with the same meter?

Accepted Answer

Reasons for varied readings include:  
  Ions:  The nature of charged positive ions (which is what the TDS meters are measuring) is that they are always moving. Therefore, there may always be variances in the conductivity, and thus a different reading. 
  Temperature:  Even with ATC, temperature changes by a tenth of a degree may increase or decrease the conductivity. Additionally, the temperature coefficient (what the reading is multiplied by to adjust for temperature differences) changes slightly depending upon the range of ppm. Our meters and virtually every meter under $500 has a single temperature coefficient, regardless of the range. (The new COM100 offers three temperature coefficient options, but each is linear once selected). 
  Air bubbles:  Even a tiny air bubble that has adhered to one of the probes could potentially affect the conductivity, and thus the reading. 
  Lingering electrical charges:  Electrical charges off fingers, static electricity off clothes, etc. on the meter and lingering electrical charges in the water will affect the conductivity of the water. 
  Container/ glass /cup material:  Plastic cups retain lingering electrical charges more than glass. If the meter touches the side of the glass or plastic, it could pick up a slight charge. If the plastic is retaining a charge, it could also affect the water. 
  Volume changes:  The amount of water in the sample may affect the conductivity. Different volumes of the same water may have different levels of conductivity. Displacement may affect the conductivity as well. 
  Probe positioning:  The depth and position of the probe in the water sample may also affect the conductivity. For example, if a meter is dipped into the water, removed, and then dipped into the water again, but in a different spot, the reading may change.

Question 13

How can I get the best possible readings?

Accepted Answer

Rinse:  Always rinse probe with the sample to be measure just before measurement. 
  Stir/tap:  After dipping the meter in the water sample, always lightly tap it against the side and stir the meter to remove any lingering air bubbles or electrical charges. 
  Positioning:  When taking the reading, always make sure to hold the meter straight up without it touching the sides or bottom of the glass/beaker/cup. The probe should be suspended as close to the center of the water sample as possible. 
  Time:  The longer the meter is in the water, the more accurate the reading will be.  
  Temperature:  25 degrees Celsius is the ideal temperature for conductivity readings, even if the meter has ATC. 
  Rinse:  If switching between very low and very high ppm water, always rinse the probes with distilled water to avoid any buildup.

Question 14

What if the TDS values for purified water from tap is high and not meeting the TDS reduction claim?

Accepted Answer

As you are aware, Pureit water purifiers have mineral enhancer cartridge post RO membrane which adds back natural minerals in the range 5 ppm to 60 ppm into the RO purified water and water with these minerals get stored in purified water storage tank, and hence for calculation of TDS reduction, one should use the water ex-RO membrane and get that water tested for TDS, but this should be done by an authorized service technician only. While TDS meter give broad idea on RO membrane performance, it is recommended to get feed water and water Ex-RO membrane checked for TDS values from BIS approved 3rd party lab (URL for BIS website for approved lab list).

Question 15

What is the accuracy of TDS meter?

Accepted Answer

As you are aware, Pureit water purifiers have mineral enhancer cartridge post RO membrane which adds back natural minerals in the range 5 ppm to 60 ppm into the RO purified water and water with these minerals get stored in purified water storage tank, and hence for calculation of TDS reduction, one should use the water ex-RO membrane and get that water tested for TDS, but this should be done by an authorized service technician only. While TDS meter give broad idea on RO membrane performance, it is recommended to get feed water and water Ex-RO membrane checked for TDS values from BIS approved 3rd party lab (URL for BIS website for approved lab list).

Question 16

How does Pureit Lithos RO+UV+MF work?

Accepted Answer

Pureit Eco Water Saver Mineral RO+UV+MF has a 8-Stage Purification Process which ensures you get water that is sweet and always safe. 
 In the first stage, the water passes through the  Pre-Sediment Filter  which removes fine and coarse particulate impurities/dirt. 
 The second stage is the  Pre-RO Carbon Filter  that removes chlorine and organic impurities like harmful pesticides. It also adsorbs bad taste and odour-causing organic compounds from water. 
 The third stage is the  Mesh Filter  which removes the remaining dirt. 
 Then the water passes through the  RO Membrane  at high pressure, with the help of an inbuilt pump. The RO Membrane removes dissolved salts, hardness, pesticides and heavy metals like arsenic, lead and mercury. It also removes microbial contaminants like bacteria, virus, protozoa and cysts. 
 Fifth stage is a high intensity  UV Chamber  that acts as an additional stage of purification to further inactivate bacteria, virus and parasites to deliver safe water. After the UV Chamber, water passes through a  Compound Post carbon +  Mineral cartridge that adds adequate quantities of essential minerals to the water and at the same time acts as a polisher and enhances the taste of purified water. 
 Last stage is the  Micro Filtration (MF) Membrane  which added Post-RO and ensures that the water is purified not once but thrice!

Question 17

What is the storage capacity of Pureit Lithos RO+UV+MF?

Accepted Answer

Pureit Lithos RO+UV+MF has a storage tank capacity of approx 9.5 to 10 litres under running water. The process of filling the storage tank is fully automatic and when you take water out of the tank, the purification process automatically starts and refills the storage tank.

Question 18

How much time it takes to purify water in Pureit Lithos RO+UV+MF?

Accepted Answer

Pureit Lithos RO+UV+MF can purify water upto 24 litres per hour. However, the time taken to purify depends on the life of the filters, the input water pressure, TDS and other impurities present in water.

Question 19

How will I get new Consumables/Membranes replaced?

Accepted Answer

You need to call the Pureit Helpline and order for a Germkill Kit. Our technician will visit your place and replace the Germkill Kit at a nominal cost.

Question 20

Why is the “Tank Full” indicator blinking when I switched on the purifier for the first time?

Accepted Answer

Pureit Lithos RO+UV+MF has been designed in such a way that during the first time startup of the device, the “Tank Full” indicator will blink for approximately 15 minutes and then normalise for usage.

Question 21

Can I drink the first purification cycle of water from the purifier?

Accepted Answer

No. After Pureit Lithos RO+UV+MF is installed or whenever the Germkill Kit(s) are replaced, discard the first cycle of water (10 litres) that is filled in the storage tank.

Question 22

What should I do if there is no purified water in the storage tank?

Accepted Answer

In case there is no purified water in the storage tank then you need to first check for LED indications. If it shows Tank icon blinking post installation, there is no water supply then you can check whether the Ball Valve is closed or the power is off. If none of the above cases are true, please call Pureit Helpline.

Question 23

Can I open and service my purifier?

Accepted Answer

It is not recommended to open and service device by an individual. Call our Pureit Helpline if you face any issue which requires servicing and opening the device.

Question 24

Can I use any type of water to purify through my Lithos RO+UV+MF?

Accepted Answer

Pureit Lithos RO+UV+MF will purify “potable” water for removal of hardness and other impurities to give you safe drinking water. If the input water has impurities normally not present in drinking water (high iron/ turbidity/ microbial contamination etc.) or water is from unknown source (river/lake/pond/ borewell etc.) then suitable pre-treatments may be required.

Question 25

The Advance Alert System did not give me 15 days warning before the purifier stopped working. Why is it so?

Accepted Answer

There may be several reasons for this: While the Germkill Kits and the Pre-Sediment Filter have fixed replacement schedules, depending on your input water quality the Pre-Sediment Filter might need a replacement even before the purifier gives you an alert. In such cases, please contact Pureit helpline on 1800-570-1000 and get the Pre-Sediment Filter cleaned/replaced. Also, Advance Alert System will alert you basis the pump running hours. The purifier will communicate the alert only if the purifier is in a switched on condition during the scheduled alert time. Post the completion of the scheduled alert time, Auto Shut Off will be activated automatically for the GKK.

Question 26

Does Pureit Lithos RO+UV+MF remove arsenic, flouride and nitrates?

Accepted Answer

Like other ions, the RO technology can also remove arsenic, flourideand nitrates asper IS 16240:2023, however, RO system is not recommended for arsenic level above 0.1 mg/litre, fluoride level above 8.0 mg/litreandiron level above 0.3 mg/litre

Question 27

Can I use the reject water?

Accepted Answer

It is not recommended to use the reject water for any kind of consumption (drinking or cooking). It can probably be used for gardening or cleaning floors.

Question 28

What should I do if any part of the purifier is broken?

Accepted Answer

Please call the Pureit Helpline. We will guide you on the repairs required. You would need to buy the replacement parts at an additional cost.

Question 29

What should I do if there is a leakage from the purifier?

Accepted Answer

Turn off the Ball Valve and switch off the power, if you find any failure. Check for any visually improper fitments and then call our Pureit Helpline at 1800-570-1000 and register a service request.

Question 30

How long the stored water in Pureit Lithos RO+UV+MF can be used for drinking?

Accepted Answer

You can use stored water for 2 days. If it is not used for more than 2 days we advice you to discard that water, refill and then consume.

Question 31

Can the Pre-Sediment Filter or the other filter parts choke before the Advance Alert ?

Accepted Answer

While the Germkill Kits and the Pre-Sediment Filter have a fixed replacement schedule, you might be required to change the filters in the interim depending on the quality of your input water. 
 Should the tap flow rate be very less or if it is taking too long for the tank to fill, then please contact the Pureit helpline at 1800-570-1000 to change the membranes. These extra visits will be chargeable as per T&C.

Question 32

How can I clean my Pureit Lithos RO+UV+MF?

Accepted Answer

It is recommended to clean dry or wet wiping by 3M mop cloth. Do not spray water on the device front cover as it may damage the electronic part. Do not use soap or hard cleaning detergents.

Question 33

What should I do if the water from the purifier tastes unusual or the purification is taking more time?

Accepted Answer

Please call the Pureit helpline at 1800-570-1000. Our technician will visit you and help you resolve all the issues.

Question 34

What are the ideal usage conditions for an RO technology based water purifier?

Accepted Answer

The point-of-use reverse osmosis drinking water treatment systems addressed by NSF-58 standard are designed to be used for the reduction of specific substances that may be present in drinking water supplies (public or private) which are considered to be microbiologically safe and are of known quality.

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