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Reverse Osmosis Versus Ultraviolet Technology

Reverse Osmosis versus Ultraviolet Technology

Why UV technology out-weighs RO water purification methods

Water is a precious and scarce commodity. The preservation of water and making sure it is clean is this year’s top priority. Therefore, we need to ask the question whether we are using this scarce commodity to its fullest potential. Are we using purification method that is giving us optimal results regarding cleaner water? Do we get the optimal quantity of water once it the water has been purified?

The leading methods in water purification are Reverse Osmosis and UV water purification. Let’s have a look at these two methods, their differences and furthermore why UV technology is the more efficient and viable option.

What is Reverse Osmosis?

Reverse Osmosis is a process in which dissolved inorganic solids (such as salts) are removed from a solution (such as water). This is accomplished by household water pressure pushing the tap water through a semipermeable membrane.

What is UV water purification system?

An ultraviolet water purification system typically consists of a UV light source with an output of around 254 nanometres which produces radiation of a significantly greater intensity than the radiation produced by sunlight.

How does UV water purification differ from RO water purification?

– RO purification produces lots of wastewater. With UV water purification, there is no wastewater generated in the process.
– RO takes more time to purify than UV water purification.
– For a capable RO system, it requires electricity to boost the water pressure whereas, with a UV system, regular tap water pressure would work.

Why UV water purification out-weighs RO water purification?

Both Reverse Osmosis and UV water treatment have their drawbacks, i.e. the need for electricity and the fact that UV cannot remove dissolved water. However, UV water purifications out-weighs reverse osmosis in that it is more affordable to use UV technology and furthermore there is no wastewater when using UV water purification methods.
UV water purification is a very cost-effective way to kill a majority of harmful microbes associated with most common water-borne illnesses. Viruses such as the hepatitis virus, which is known to be highly resistant to chlorine-treated water, are quickly eliminated through UV treatment.

UV water filters do not introduce chemicals in the water. As a result, the taste and colour of the water remain virtually unaltered, and there is also no danger of any harmful by-products resulting from the use of UV filters. Also, UV water purifiers are easy to install, are easy to maintain and do not damage septic tanks or plumbing.

What is UV Water Purification and the Benefits of Using it?

With so many water treatment solutions available today, it makes it difficult to choose the correct application and most beneficial one to install.  Most systems have several pros and cons but have you considered using a UV Water Purification System?  Here is how it works and the benefits of using one.

glass full of water from uv water purification system



An ultraviolet (UV) water purification system uses UV light to remove contaminants from untreated water.  Its electromagnetic radiation is used to decontaminate the water from various chemicals, bacteria and other materials such as chlorine.


A germicidal or mercury vapour lamp is used to create UV light.  A glass component of the lamp creates a transparent surface for the shortwave UV light to pass through, which eliminates any bacteria or microorganism that it encounters.  This form of water treatment is quick, energy efficient and 20 000 times more effective than boiling water.



UV Water purification does not make use of any chemically-active elements or heat.  Other systems use chlorine, which has a higher toxicity level and makes the water taste bad.  UV disinfection can remove chlorine traces in water.


All that is required after the system has been installed is a yearly service appointment to ensure that the system is performing effectively.


UV systems destroy 99.99% of microorganisms.


UV is environmentally friendly as it does not make use of disinfection byproducts.


The system runs consistently throughout the day and night.  It never switches off providing an unlimited supply of safe drinking water whenever the tap is turned on.


The only expense after installation is to replace lamps and sleeves annually.


There is no delay in purification and water flow and there is no need for a holding tank or reaction time.


Very little electricity is used to purify the water as the production of UV light is cost effective.


The system is easy to maintain and there is no handling of chemicals or dirty parts to clean and dispose of.


Chemical disinfection methods change the taste and smell of water and produce byproducts, which UV water purification does not.

UV Water purification is an outstanding way to meet your water purification needs because it has proven to be one of the most reliable, quick and cost-effective methods for disinfecting water.  Call us or contact us via our website for more information on this system or a quote.

Hanovia Pools Bro vis

From the smallest private pool to the largest leisure complex, you need to meet regulations
for water quality and make sure that your pool users are safe and comfortable in the water.
Chloramines in your pool water can cause unpleasant smells and even allergic reactions.
Hanovia UV systems destroy them as well as dangerous waterborne micro-organisms
including Cryptosporidium and Giardia. Your pool users will enjoy fresher-smelling, clearer
and more hygienic water, while you enjoy the reliability and effectiveness of a highly efficient
water treatment system.
A superior solution that guarantees high quality pool water. The benefits of Hanovia’s UV treatment system are far-reaching:

• Destroys chloramines – easily meets statutory
combined chlorine levels and typically reduces levels
to less than 0.5ppm
• Effective against all micro-organisms, including the
chlorine-resistant pathogens Cryptosporidium and Giardia
• Improves water clarity
• Treats full recirculating flow
An energy efficient and environmentally
responsible system
• Reduces the need for dilution
• Cuts the use of chemicals and avoids the need for routine
shock dosing with chlorine
• Reduces requirement for free chlorine residual
• Creates no hazardous by-products
• Reduces corrosion of steel structures – minimising
maintenance costs
Controlling costs
• Cuts your use of chemicals
• Requires little maintenance
• Reduces energy bills if you use the Power Switching option
• Reduces water bills, as there is no need to control combined
chlorine levels by dilution and back-washing
• Avoids repair and replacement costs from chemical wear
and tear on pool fittings
Attractive pool environment
• Increases bather and employee comfort
• Appeals to new customers and visitors and enhances
your reputation
• Competitive advantage compared to other local
leisure facilities.

Two ways that UV improves pool water

Reduces chloramines

Chloramines are the unpleasant chemicals formed when
chlorine combines with the nitrogenous compounds (uric acid,
urea, ammonia, histidine and creatinine) introduced by bathers.
They are responsible for eye irritation, headaches, unpleasant
odours and occasional skin irritation, particularly in indoor
pools. Swimmers, lifeguards, instructors and coaches can all
be affected. Chloramines also damage the structure of the pool,
corroding structural steel and roof supports.
UV treatement is a high performance alternative to superchlorination
(or “shock” dosing), dilution with fresh water
or activated carbon. Low pressure UV lamps are not effective
against all chloramines. Hanovia’s medium pressure UV lamps
break the bonds within chloramine molecules and destroy
them. The lamps’ polychromatic spectrum includes the optimum
wavelengths for chloramine photolysis.
Monochloramine (NH2Cl): 245 nm
Dichloramine (NHCl2): 297 nm
Trichloramine (NCl3 ): 260 nm and 340 nm
The polychromatic spectrum of Hanovia medium pressure
lamps includes all these wavelengths. The monochromatic
UV emission of low pressure lamps at 253.7 nm will not be
absorbed by dichloramine or trichloramine molecules and no
photolysis of these compounds will occur.

Disinfects and clears comprehensively

The disinfecting power of Hanovia UV means you can drastically
reduce residual chlorine levels to as little as 0.5 ppm. Organic
molecules in the pool water are oxidised, for noticeably
improved water clarity.
Even chlorine-resistant pathogens like Cryptosporidium and
Giardia are effectively treated with UV. Cryptosporidium is
responsible for hundreds of thousands of outbreaks of gastric
illness every year, with outbreaks often traced back
to swimming pools. It is a parasite whose structure makes
it resistant to chlorine disinfection. Using Hanovia UV
technology you can reduce its presence in your water
by 99.99%, according to the United States Environmental
Protection Agency.
Eighteen outbreaks of Cryptosporidiosis associated with swimming
pools are known to have occurred in the UK between 1989 and 1999.
In the USA from 2003 to 2004, Cryptosporidium was responsible for
55.6% of gastroenteritis outbreaks associated with swimming pools.