Saravanan Ragothaman

ACKNOWLEDGEMENTS

To prepare this text, several people have helped me. It is my pleasure to express my gratitude

to all of them.

First of all I want to thank Mr.A.Sathish Kumar, TSO, Hindustan unilever-Water Div,

Krishnagiri, who gave me the opportunity to do internship in one of the world’s

prestigious organization.

My grateful thanks to Mr.J.Samson Selvakumar, TSO, Hindustan unilever-Water Div,

Coimbatore, who initiated and encouraged me to prepare this text.

Mr.Sesha, CCO, Hindustan unilever-Water Div, Coimbatore, who directed me in the

right path to prepare this text. I am grateful to him.

My sincere thanks to Mr.R.Sridhar, Symphony Supervisor, Hindustan unilever-Water

Div, Coimbatore, for training me and giving me a wonderful experience. I thank him

for answering my queries patiently.

Last but not least my hearty thanks to

Dr.R.Nanda Gopal,

Director,

PSG Institute Management.

and

Deepa Ranganathan

Assistant Professor

PSG Institute of Management.

Saravanan Ragothaman

+91-9003881369

saravanan035@gmail.com

A Reference text for PWE, Pureit

PSG Institute of Management

Coimbatore - 641 004

CONTENTS

1. PUREIT MARVELLA RO Key Features

Reverse Osmosis

Process Overview

5 Purification Stages

Sedimentation Filter

Carbon Filter

Triple safety assurance

Highest Level of TDS Removal

RO Purity Lock System

Advance Alert System

Large 9 liters Storage Tank

Break Resistant Tap

Voltage Fluctuation Guard

Water Flow

Comparisons

2. PUREIT MARVELLA UV Features

UV Technology

How UV rays work on harmful microorganisms

3 Stage Purification process

Pre Filter

Mini Filter

UV Exposure

Water Flow Diagram

Comparisons

3.PUREIT ADVANCED

Features

4 Stage Purification

Advanced Microfiber Mesh

Carbon Polisher

Germ kill Processor

Microcharged Membrane

Comparisons

1. PUREIT MARVELLS RO

Key Features:

Reverse Osmosis

5 Purification Stages

Ultra Ventilated Membrane

9 L Total Capacity

RO Membrane Change Alarm

Filter Change Alarm

Wall Mount

Advance Alert System

Triple Safety Assurance

Reverse Osmosis:

Osmosis is the natural tendency of water with a low concentration of dissolved particles (pure

water) to move across a semi-permeable membrane to an area of water with a high concentration of

dissolved particles (water with high TDS).When it happens in viceversa then it is called Reverse Osmosis.

Fig. 1:

Initially the level of dilute solution will be high and the level of concentrated solution

will be low. As stated earlier, due to Osmosis process, dilute solution is trying to move through

membrane towards concentrated solution. But membrane will allow only water (H2O) and act

as a barrier for other molecules. Therefore the water (H2O) in the dilute solution is moving

continuously to concentrated solution.

Fig. 2:

After a while the water arrives at the concentrated solution side and other molecules

like virus, bacteria stay in the dilute solution side. So the level of concentration solution

increases.

Fig. 3:

After Osmosis process, we have to apply external pressure on the concentrated solution

side to achieve Reverse Osmosis process.

Due to high pressure on top of the concentrated solution side the contents inside the

concentrated solution like water, salt, virus and bacteria and other impurities try to escape to

dilute solution side through the membrane. But membrane allows only water and keeps other

contents in concentrated solution side. This process continuously happens until the pressure

level equals to the level increased in concentrated solution (Fig 2).

Fig. 4:

Then finally we will get the figure as same as fig. 1. After Osmosis we may remove the

waste water from dilute solution side and can do Reverse Osmosis process. If we do like this

way, we can get purified potable water in the dilute solution side at the end of the process.

PROCESS OVERVIEW :

Feed solution containing ions, organics and impurities like microorganism, salt etc. is fed

into the spiral wound membrane element. In the output side there are two types named

permeate and concentrate. Permeate part carries pure water and concentrate part carries

brine and other impurities.

The above figure shows how Water molecules get separated from other molecules (salt,

micro organic etc.).The feed channel spacer allows feed solution to pass through it. But the

outside of feed channel spacer is covered by membrane. The membrane has a number of holes

of size about 0.0001 μm. So the water can only escape through that holes and other particles

passes straightly and get out as waste water

5 Purification Stages:

It is an advanced 5 stage purification technology comprising of Pre SF + CF + Post SF +

RO + UVM which ensures 100% pure and safe water.

Sedimentation Filter (pre + post):

It is used to remove suspended material like sand, mud, silt (small rocks) etc.

Carbon Filter:

Removes harmful parasites and pesticides

It is also most effective at removing volatile organic compounds (VOCs) i.e organic chemicals like

chlorine from water

Removes unwanted color to give clean water

Removes foul odour

Triple safety assurance:

Pureit Marvella RO is powered with RO, UVM and ROPL which purifies the water not

once but twice, ensuring you always get only 100% pure drinking water.

Highest Level of TDS Removal:

Pureit Marvella RO removes dissolved impurities in water like heavy metals, rust and

excess salts to turn hard water of upto 2000 PPM into soft and tasty water.

RO Purity Lock System:

It is the added unique feature of Pureit Marvella RO to lock the RO membrane when its purifying power is over. It ensures that you never have unsafe water.

Advance Alert System:

This unique feature gives you 4 different warnings including a 15-day advance warning

before the RO membrane shuts off.

Large 9 litres Storage Tank:

Pureit Marvella RO has 9 litres of storage tank. So you don't need to fill water in vessels

or water bottles.

Break Resistant Tap :

Fitted at a height to ensure easy filling of bottles and tested upto 50,000 times for break

resistance.

Voltage Fluctuation Guard:

This protects your purifier from sudden voltage fluctuation from as low as 130 volts to

as high as 230 volts.

Water Flow:

First the input water is fed into sediment filter to remove suspended material

like sand, mud, silt (small rocks) etc. The output of sediment filter is given to low

pressure switch (LPS).The LPS checks whether the input pressure is in the range

between 5-10 psi. If the pressure is in the range then the water is transformed into

carbon filter. In the carbon filter it removes harmful parasites and pesticides are

removed. It also removes odor and unwanted color in water. Then this water is given to

post sediment filter to remove remaining suspended materials to make sure that there

are no suspended material inside the input water of RO membrane. The pump is used to

pump the water to forward direction. There are two water outputs from RO membrane.

One is purified water which is going to storage tank and another one is brine water

which is ejected as waste water.

Comparisons:

Specifications Pureit Marvella RO Kent Super+

Aquasure Spring fresh DX RO

Image

Price 13,500 14150 14999

Storage Capacity

9L 8L 8L

Purification Stage

5 stage 4 stage 5 stage

Secondary Purification

Yes Ultra Ventilation

Membrane

Yes Ultra filtration

Membrane

NA

RO Membrane & Filter change

Alarm

Yes

NA

NA

15 day Advance alert

system

Available

NA

NA

Weight 8.3 kg 7.3 kg 9.5 kg

Material of

Body

Food Safe,Non-Toxic, Engineering-Grade ABS

Plastic

Using ABS Plastic

only

Using ABS Plastic only

TDS Removal Level

Upto 2000 ppm

Upto 2000 ppm

Upto 2000 ppm

RO Purity Lock System

Available

NA

NA

Water tank full electrical indication

Available

NA

NA

Glass holding facility

Available

NA

Available

Tap

Break Resistant Tap tested upto 50,000

times for break resistance.

Ordinary tap

Ordinary tap

Voltage Fluctuations

Guard

Available

Available

NA

Purification Capacity

Information couldn’t get

15 liters/hour

Information couldn’t get

Tenure of Carbon &

Sediment Filter

4000 liters

3000 liters

Tenure of RO Membrane

8000 liters Information couldn’t

get

6000 liters

Warranty Period

1 year Replacement warranty

1 year Ordinary

Warranty

1 year Ordinary Warranty

SAFETY CHALLENGE

1 crore safety challenge-

Unclaimed for 2 years

NA

NA

PUREIT MARVELLA UV

Features:

UV technology

4 L storage

Wall mounting

Input voltage 12VDC

Outside Adaptor – 12VDC supply to device

Auto-shutoff mechanism for battery

Advanced alert system

LED display

Microprocessor controlled battery life

Battery Kit – Pre filter – 3000L

Working pressure range 5-30 psi

UV Technology:

Ultra-violet (UV) treatment is the process of passing water in front of a special light

source. The special light source emits UV waves that can inactivate harmful microorganisms.

This method of treatment is growing in popularity because it does not necessarily require the

addition of chemicals.

How UV rays works on harmful microorganisms:

Naturally, Sun has UV rays which have power to inactivate (Note: UV rays do not kill)

harmful microorganisms. Here, the UV lamp is used to produce UV rays which is similar to the

rays produced by the sun, but stronger. These rays alter the Deoxiribo nucleic acid (DNA) of

viruses, bacteria, molds or parasites, so that they cannot reproduce and are made inactivate.

UV treatment does not alter the water chemically. Because we are not using any chemicals like

chlorine to kill the microorganisms. It should be noted that inactivated microorganisms are not

removed from the water. UV treatment does not remove dirt and particles, metals such as lead

or iron, or hard minerals such as calcium. So here we are using two different types of filter

named Pre filter and Mini filter to remove particles, metals and minerals.

3 Stage Purification process:

Pre filter

Mini filter

UV Exposure

Pre Filter:

It is used to remove suspended material like sand, mud, silt (small rocks) etc.

Mini Filter:

It is like pre filter. It is also used to remove sand, mud and makes sure that no suspended

material will enter into the UV purification stage and purify water not once but twice.

UV Exposure:

Here the suspended material free water is exposed to UV rays through Quartz tube.

Water Flow Diagram:

First the unpurified input water is given to low pressure switch to check if the pressure

level is in between (5-30) psi. If the pressure level is in the range then the water will go to pre

filter. Pre filter removes suspended materials. The output of the pre filter is given to mini filter.

It also removes suspended materials to make sure that the input of UV exposure does not

contain suspended particles. The UV lamp is placed inside the Quartz tube. It acts as a medium

between water and UV lamp. So that it protects direct exposure of UV rays on water. This type

of filtration is the best in UV filtration. The input of UV exposure is controlled by flow resister.

Flow resister is used to control the water flow inside the UV exposure. So that it maintains the

flow rate about average of 650 ml. Because of this, UV rays can inactivate all the harmful

microorganisms inside the water. Then the output of UV exposure is given to storage tank to

drink.

Comparisons:

Specifications Pureit Marvella UV Kent Maxx Aquasure Crystal

Image

Price 7990 7950 8499

UV lamp High Intensity 11 watts

11 watts 8 watts

Storage Facility Available Available NA

Advanced Alert System

Available NA Available

Input Voltage 12 VDC (160-300) VAC (130-270) VAC

Tank Full Indicator Available NA NA

Tap Break Resistant Tap tested upto 50,000

times for break resistance.

Ordinary tap

Ordinary tap

Voltage Fluctuations Guard

Available NA Available

Flow Resistor Available NA NA

Material of Body Food grade, non – breakable,

transparent ABS plastic construction

Food grade, non – breakable, transparent

ABS plastic construction

ABS plastic construction

Safety Lock Available Available but not Automatic

Available

Purification Capacity(l/hr)

Information couldn’t get

60 Information couldn’t get

Purification Stage 3 3 3

Colors Available Information couldn’t get

White White

Weight in kg Information couldn’t get

6.1 6.5

Quartz Filtration Medium

Available NA Available

Manual Maintenance

No need No need Need manual flush frequently

UV Fail Alarm Available Available NA

Control Microprocessor control

Computer control Electronic monitor

Certification Meets USEPA standards

Does not meet USEPA Standards

Does not meet USEPA standards

Safety Challenge 1 crore safety challenge-

Unclaimed for 2 years

NA

NA

PUREIT ADVANCED

Features:

Advanced Auto-Shut-off Advanced 4 stage purification process Germ kill life indicator Double Protection Meets the standard of Environmental Protection Agency (EPA), USA, for harmful virus &

bacteria removal. Does not require a tap connection low maintenance Total capacity is 23 liters. Purified storage capacity is 9 liters Stylish sleek design

4 Stage Purification:

Advanced Microfiber Mesh:

Removes visible dirt like sand, mud and metallic impurities

Carbon Polisher:

Removes harmful parasites, pesticides and chlorine, making the water clear, odorless

and natural tasting

Germ kill Processor:

Uses ‘programmed Germ kill technology’ to target and remove harmful viruses and

bacteria

Microcharged Membrane:

Purifies the water again and removes harmful parasites giving the assurance of double

protection.

Comparisons:

Specifications

Pureit Advanced

Kent Crystal

Aquasure Amrit

Image

Price 2800 3150 2499

Purification Stage 4 stages 4 stages 4 stages

Storage Capacity 23 liters 15 liters 20 liters

Purification Capacity 1500 liters 4000 liters 750 liters .350

Germ Kill Life Indicator

Available NA NA

Material of Body

Food safe, non-toxic, engineering plastics

ABS food-grade plastic

Food Grade, Non-Toxic engineering Plastics

Auto-Shut-off Available NA NA

Double Protection

Available

NA

NA

Tap

Break Resistant tap tested upto 50,000

times for break resistance.

Ordinary tap

Ordinary tap

Certification Meets USEPA standards

Does not meet USEPA Standards

Does not meet USEPA standards

Colors Available Information couldn’t get

Sky Blue White-Sky

Weight in kg 3.7 4 2.710

Safety Challenge 1 crore safety challenge-

Unclaimed for 3 years

NA

NA