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Ultraviolet Pool Systems



Ultraviolet Pool Systems

In current years, the requisite for additional hygiene in public pools have become very distinct. Maintaining recreational pool water safe for swimmers most times necessitates more than the ordinary halogen-based sanitizer, such as chlorine, thus introduction of Ultraviolet (UV) Light Secondary Disinfection Systems. Some residential pool owners also use Ultraviolet pool systems in sanitation to improve general outcomes and minimize chlorine use.

Ultraviolet Pool Systems

Essentials of Ultraviolet Pool Systems


UV light is a range of short wavelengths of light 10nm – 400 nm and invisible to the naked eye.

Medium-Pressure UV Light Systems

Characterization of Medium-Pressure UV Light Systems is by the UV light spectrum in which they function. They function in a wavelength range of about 250 nm-600 nm. The lamps function at temperatures above 1,500 degrees Fahrenheit. In this range of wavelengths, UV light can react with various chemicals in water and deactivate chlorine sanitizers. This makes the process expensive due to the high volumes of sanitizers needed.

Low-Pressure UV Light Systems 

This is characterized by the light spectrum in which they function. The wavelength range required to function is narrow at around 190 nm to 254 nm. The wavelength of 254 nm is suitable for the destruction of chloramine. This wavelength does not affect free chlorine and operates at 140 degrees Fahrenheit, making it cost-friendly to operate.

Secondary Disinfection UV Light Systems 

Secondary Disinfection UV Light Systems are necessary on any increased risk aquatic venue as explained in ANSI/APSP/ICC-11 2019.

The explanation for this is that some pathogens like Cryptosporidium resist halogen-based sanitizers. A single pass through the reactor can make the UV light systems inactivate the pathogens. Medium-Pressure UV Light Systems are mainly used for secondary disinfection, though Low-Pressure UV Light Systems can also be applicable.

Supplemental Disinfection UV Light Systems 

For Supplemental Disinfection UV Light Systems, installation can be on any aquatic venue, not only on increased risk aquatic venues. These ultraviolet pool systems inactivate the majority of the waterborne pathogens aside from Cryptosporidium. Most Supplemental Disinfection UV Light Systems are medium-pressure systems.

Water Conditioning Device

UV light systems are the latest addition to UV light products and aren’t sanitizers. They use low-pressure UV lamps functioning at 254 nm. Compared to the Low Pressure UV Pool Systems, Water Conditioning Devices aren’t meant for use as either supplemental or secondary sanitizers but instead to improve water and air quality in indoor pools.

UV Light Dosage is the Key 

Whether a secondary, supplemental, or water conditioning device, the quantity is the most significant factor.

UV dosage relies on three important things:

Ultraviolet Transmittance (UVT) of the water

Contaminants like iron interrupt the transmission of UV light through water, despite the pool water appearing clear.

The power of the UV lamp

The amount required to get rid of monochloramines is 60 mj/cm2 for indoor pools and 40 mj/cm2 for outdoor pools.

The rate of the water flow through the UV pool systems

If the rate is slow, there is more contact time at the point of exposure to the UV light, hence accomplishing a higher dosage.

Different microorganisms require varying dosages for their deactivation. In most cases, UV light reacts faster at deactivating microorganisms than the advisable amount of sanitizer. Nevertheless, the common cold virus is resilient to UV light but can be easily deactivated by recreational water sanitizers.

The rate of water flow affects the UV system dosage. Thus, balancing suitable amounts of sanitizers and UV light systems at required flow rates can aid in providing a safe swimming environment.

Its application

UV treatment is a speedy physical process. In a UV disinfection process, pass water through a chamber containing a UV lamp. The bacteria in the water get exposed to the UV radiation generated by the mercury arc UV lamp. The radiation penetrates a microorganism’s cell wall, making it unable to mutate and damage its DNA. For this reason, it is unable to reproduce or function, making it harmless.

Most local codes will need a Secondary UV Light System installed to guarantee swimmer safety. Water conditioning UV light systems are becoming popular for indoor pools. This is because of their effectiveness in getting rid of stubborn chloramines; therefore helps improve the air quality for swimmers. UV products are normally used with spray pads as they are often categorized as increased risk aquatic venues because of their use by kids.

Maintenance and precautions

  • Maintenance is imperative in ensuring the proper working of UV light products. Medium-pressure units need ultimate care since they function at extremely high temperatures. For the glass sleeve containing the UV lamp, it is usually coated with calcium and other contaminants. These components, at times, have wipers to clean the sleeves automatically. Lamps also require constant replacement. The necessary maintenance raises the expenses on operation and energy use.
  • Low-pressure UV light products need lesser care. These lamps can function longer than medium-pressure units before necessitating a replacement. They are cheaper and also in the operating cost.
  • It is essential to adhere to all applicable electrical codes and safety measures when using UV equipment. Before servicing or making electrical connections, switch off the power at the main source. Follow the manufacturer’s instructions when operating and maintaining the ultraviolet pool systems.
  • UV light can lead to serious eye and skin damage. Don’t handle or glare at a functioning UV lamp.

Pool News coverage brought to you by Pool Magazine's own Marcus Packer. Marcus Packer is a 20 year pool industry veteran pool builder and pool service technician. In addition to being a swimming pool professional, Marcus has been a writer and long time contributor for Newsweek Magazine's home improvement section and more recently for Florida Travel + Life. Have a story idea or tip you'd like to share with Pool Magazine? Email your story idea.

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Pool News

Cody Pools Acquires Platinum Pools



Cody Pools Announced Their Acquisition and Merge With Platinum Pools

Cody Pools, an Austin-based designer and builder of premium swimming pools and spas for residential and commercial consumers, recently acquired Platinum Pools, a Houston-based designer and builder of custom luxury swimming pools/spas and digging over 350+ pools annually while serving as one of the two largest operators in the Houston market.

Cody Pools Merges With Platinum Pools

With the transaction, Cody, which was recently named the #1 pool builder in the nation for the ninth year in a row, further expanded its position in the Houston market and now represents Texas’ most prominent actor in the pool and spa industry. Main Street Capital, a publicly traded business development company, helped fund a portion of the transaction.

Cody Pools has been rated the #1 pool builder in the United States for the previous 9 years, according to Pool and Spa News. Cody Pools announced on September 10th, that they will merge with Platinum Pools and continue to use its well-known brand name. After the merger’s completion, a long-planned CEO shift is planned from Scott Waldo to Mike Church.

About Cody Pools

Cody Pools has designed and built approximately 20,000 swimming pools since its inception in 1994. They have built a reputation as a world acclaimed pool builder built on providing uncompromising quality, award-winning designs, and leadership.

Cody Pools has offices in San Antonio, Houston, Austin, and the Tampa/St. Petersburg metropolitan area. Their strong financial standing and industry-leading has helped distinguish them from other pool builders.

About Platinum Pools

Platinum Pools has been building swimming pools for over two decades and was named one of the Top 50 Pool Companies by Pool & Spa News in 2021. This year, Platinum Pools has won a number of honors. They were named Best of the Best by the Houston Chronicle in 2021, as well as Best of Houzz in Service. In addition, the BBB Award of Excellence and the Luxury Pools and Outdoor Living Pinnacle Awards were presented. Platinum Pools, has offices in Houston, Beaumont, and Victoria.

Featured Photo Credit: Platinum Pools

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Pool News

Pentair Acquires Pleatco for $255M in Cash

Align Capital Partners announced the sale of Pleatco Filtration to Pentair Plc in a $255M cash deal.



Pentair Acquires Pleatco for $225M in cash

Pentair plc (NYSE: PNR), a leading provider of water treatment and sustainable solutions, today announced that it has entered into a definitive agreement to acquire Pleatco, a manufacturer of water filtration and clean air technologies for pool, spa and industrial air customers. Pleatco is a current portfolio company of Align Capital Partners, a private equity firm with investment teams in Dallas, TX and Cleveland, OH.

The planned acquisition of Pleatco provides Pentair an expanded range of replacement filter products to be sold through Pentair’s existing Pool and Spa distribution channels as well as through Pleatco’s distribution channels.

“We are excited to expand our presence in the aftermarket filtration space with an enhanced product offering that advances our objective to offer an effortless pool experience for consumers,” said John Stauch, Pentair President and CEO.

The planned acquisition also expands Pentair’s Industrial Filtration portfolio, with complementary air filtration products to serve the needs of its industrial customers.

“We look forward to welcoming the Pleatco employees to Pentair and to growing the relationship with Pleatco’s existing customer base,” continued Stauch. “The planned combination will provide Pleatco entry to Pentair’s global distribution and sales channels, and deliver increased production capacity and utilization, as well as build on Pleatco’s track record of product innovation.”

Total consideration for the transaction is approximately $255 million in cash, subject to customary adjustments. Pentair expects Pleatco to generate approximately $95 million of annual revenue in 2021. The transaction is expected to be accretive in its first full year.

The acquisition is anticipated to be completed in the fourth quarter, subject to customary closing conditions and necessary regulatory approvals, including expiration of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended.


Pentair makes the most of life’s essential resources. From our residential and business solutions that help people move, improve and enjoy their water, to our sustainable innovations and applications, we deliver smart, sustainable solutions for life.

Pentair had revenue in 2020 of $3 billion, and trades under the ticker symbol PNR. With approximately 9,750 global employees serving customers in more than 150 countries, we work to help improve lives and the environment around the world. To learn more, visit


Pleatco is a leading designer and manufacturer of aftermarket pleated filter cartridges, pleated bags, and other filtration products for the industrial air and pool / spa markets across USA and Europe. Pleatco Filtration brings together the combined forces of former brands APEL, Milton, and TVS and incorporates stand-alone brands Guardian Filtration, EFI and ECO Filtration under the one umbrella, leveraging collective engineering, manufacturing, and logistics resources to deliver best-in-class products backed by industry leading sales, marketing, and customer service teams. For more information, visit


This release contains statements that we believe to be “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. All statements made about the anticipated acquisition, including the anticipated time for completing the transaction, the expected financial results of the acquired business and the anticipated benefits of the acquisition, are forward-looking statements subject to risks and uncertainties, such as the company’s ability to satisfy closing conditions, integrate the acquisition successfully, and retain customers and employees of the acquired business; the impact, duration and severity of the COVID-19 pandemic, virus variants and vaccination rates, including actions that may be taken by us, other businesses and governments to address or otherwise mitigate the impact of the COVID-19 pandemic and the negative impacts of the COVID-19 pandemic on the global economy; overall global economic and business conditions; supply, demand, logistics, competition and pricing pressures related to and in markets we serve; failure of markets to accept new product introductions and enhancements; the impact of raw material costs, labor costs and other inflation; the impact of seasonality of sales and weather conditions; our ability to comply with laws and regulations and the impact of changes in laws, regulations and administrative policy, as well as other risk factors contained in our filings with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the year ended December 31, 2020. All forward-looking statements speak only as of the date of this release. Pentair plc assumes no obligation, and disclaims any obligation, to update the information contained in this release.


Jim Lucas
Senior Vice President, Treasurer, FP&A and Investor Relations
Tel: 763-656-5575

Rebecca Osborn
Senior Manager, External Communications
Tel: 763-656-5589

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Pool News

9/11 Memorial Pools – An In Depth Look at The Two Reflecting Pools

On the 20th anniversary of the September 11th attacks, we look at the two pools and Delta Fountains, the pool builders behind the 9/11 Memorial.



9/11 Memorial Pools - A Look at the Reflecting Pools

As the 20th anniversary of the attacks on September 11th approach, we take a moment to look at the 9/11 Memorial and the two reflecting pools that mark the footprint of where the Twin Towers once stood.

We are now looking back at a point in history that occurred before approximately 28.5% of Americans were ever even born. There are many memorials for the victims of 9/11, but none clearly encapsulate the raw emotions of absence the way the 9/11 Memorial does.

A look at the two reflecting pools at the 9/11 Memorial

Two reflecting pools mark the exact place of the World Trade Center and stand as a permanent place of remembrance. Both pools commemorate the names of nearly 3,000 killed in the attacks on September 11, 2001 and the World Trade Center bombing of February 26, 1993. Each of the victims names are inscribed on bronze parapets surrounding both of the memorial pools.

The two pools at the 9/11 Memorial have attracted millions of visitors each year since it first opened.
The two pools at the 9/11 Memorial have attracted millions of visitors each year since it first opened.

It’s hard to believe that two decades have gone by since the day happened that would forever change the course of our modern history. 9/11 is a moment in time that will live in as much infamy as December 7th (the attack on Pearl Habor), perhaps even more so in our generation. September 11th is important to people, and the memorial embodies what it means not only to New Yorkers who were first-hand witnesses, but to Americans who watched the events of September 11th unfold live on television.

The mourning and sorrow the nation still feels even twenty years later is evident in the amount of visitors the 9/11 Memorial draws each year. The memorial site was built to remember the victims as well as those involved in the rescue and recovery efforts.

‘Reflecting Abscence’ – The 9/11 Memorial Pools Commemorating The Victims of the September 11th Attacks

Why did they choose reflecting pools for the memorial site?

Tracing their roots back to the ancient Persian gardens, reflecting pools have been a time honored traditional memorial structure and a water feature typically found in gardens and parks. One of the most iconic reflecting pools is at the Lincoln Memorial in Washington D.C. Most reflecting pools are shallow vessels and can range in size from as small as a bird bath to as large as a major civic center water feature like the one found at the 9/11 memorial site.

The 9/11 Memorial Design Competition

An open competition for designing the memorial site drew 5,201 entries from 63 countries. The thirteen-member jury chose eight finalists on November 19, 2003.

At a press conference held at Federal Hall National Memorial on January 14, 2004, the final design for the 9/11 memorial was revealed to the public. Israeli-American architect Michael Arad of Handel Architects and landscape architecture firm Peter Walker and Partners concept ‘Reflecting Absence‘ was chosen as the winning design. Their design consisted of a forest with two large, recessed pools that represent the Twin Towers’ footprints.

Landscaping of the 9/11 Memorial plaza was done by Peter Walker & Partners Landscape Architecture
Photo Credit: Peter Walker and Partners Landscape Architecture

The deciduous trees (swamp white oaks) form informal clusters, clearings, and groves when arranged in rows. The park is located above the Memorial Museum, at street level. The names of the victims of the attacks (including those from the Pentagon, American Airlines Flight 77, United Airlines Flight 93, and the 1993 World Trade Center bombing) are inscribed on the parapets surrounding the waterfalls.

‘Reflecting Absence’ stands in the footprints of the Twin Towers

‘Reflecting Absence’ consists of two 1-acre pools. The structures are the largest man-made waterfalls in the United States. Both pools symbolize the loss of life and the physical void left by the attacks. The dual waterfalls are meant to drown out the sounds of the city, and create a peaceful haven of remembrance for what was lost.

The names of the victims of the September 11th attacks are engraved into 152 bronze parapets on the North & South pools.
The names of the victims of the September 11th attacks are engraved into 152 bronze parapets on the North & South pools.

Remembering those who were lost

On 152 bronze parapets on the memorial pools, the names of 2,983 victims are inscribed: 2,977 killed in the September 11 attacks and six killed in the 1993 World Trade Center bombing.

North Pool & South Pool name layouts for the 9/11 Memorial
North Pool & South Pool name layouts for the 9/11 Memorial – Photo Credit: 9/11 Memorial & Museum

The two reflecting pools at the 9/11 Memorial

The North and South Fountains at the 9/11 Memorial have combined recirculating systems that pump up to 26,000 gallons of water per minute non-stop every day of the year. The water flows over the memorial’s two deep reflecting pools’ walls before being recirculated into catch basins.

The September 11 Memorial utilizes a method of keeping water constantly flowing from a 30-foot drop regardless of the weather New York City gets. The pool is engineered in such a way so that it’s reflective qualities and the sound of falling water remain consistent through the changing seasons.

Both the North & South pools have a 30 foot waterfall.
Both the North & South pools have a 30 foot waterfall.

The Builders of The 9/11 Memorial

You may not know this, but Delta Fountains are the pool builders responsible for building the 9/11 Memorial pools. Joe Petry, President of Delta Fountains said the company has done architectural and floating fountain designs for universities, police memorials, parks and more. They are also the firm behind the Oklahoma City memorial reflecting pool, built in honor of the lives lost on April 19, 1995 and the memorial at the Pentagon. Delta collaborated on the project with Siemens for the automation, pump and flow controls. Dan Euser of Waterarchitecture also worked on the project as well

Joe Petry – President of Delta Fountains, the pool builders behind the 9/11 memorial pools – Photo Credit:

Challenges in Engineering

There were more than a few challenging engineering feats Delta had to achieve in order to build the pools for the 9/11 memorial site. The weir structure they devised had specific requirements, one was the ability to easily adjust and level water flow to within 1/16th inch over 1400 linear feet.

The 9/11 Memorial took ten years of planning and building before it was completed in 2011.
The 9/11 Memorial took ten years of planning and building before it was completed in 2011.

Another challenge for Delta was avoiding dry spots. Engineers accomplished this thanks to integral-design adjustability which allows for constant expansion and contraction of adhesive materials while still maintaining structural integrity. They devised a method of adding ribs which helped to prevent buckling and allowed field welding.

16 pumps to blast an impressive 26,000 gallons a minute over the 30-foot deep black granite walls of the 9/11 memorial
16 pumps blast an impressive 26,000 gallons a minute over the 30-foot deep black granite walls of the 9/11 memorial

How the reflecting pools are controlled and maintained

By far one of the most impressive aspects to these two reflective pools is the sophisticated smart chemical filtration system they use. The system is able to anticipate and react to New York’s inclimate weather conditions on the fly.

Chief Engineer – Anthony LoCasto, says it takes a crew of three men to clean the pools 5 nights a week and roughly 8 hours to clean, vaccuum and brush each of the memorial pools.

Watch the maintenance crew caring for the pool at the 9/11 memorial site.

Both of the pools utilize a total of 16 pumps to circulate 26,000 gallons of water each minute. The system is responsible for circulating over 480,000 gallons of recycled water.

There is also a cutting-edge networked control management system which effectively monitors over a thousand different data points about the pools to maintenance personnel, making it one of the smartest pools on the planet.

White Rose displayed above one of the victims names. – Photo Credit: Rudy Stankowitz

The maintenance crews perform goes far beyond simply maintaining the pools; displaying a reverence for the victims with gestures of remembrance. One of their duties is placing a white rose on top of each victim’s name who has a birthday each day before the memorial opens to the general public.

The project, which also includes an underground museum that utilizes parts of the fallen towers, had a budget of $610 million and offically opened to the public on September 12, 2011; ten years and one day after the September 11th attacks.

Watch a time lapse of “How the 9/11 Memorial Was Built“. We hope you’ve enjoyed this article on learning what role folks in the pool industry had in creating the September 11 memorial. If you think it’s important to share the story, please do so. Feel free to make a donation to the 9/11 Memorial & Museum who are preserving the history of the events of September 11th for future generations to come.

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