An employee grabs water purification tablets that kill viruses to go into a personal protection and survival equipment kits ordered by customers preparing against novel coronavirus, at Nitro-Pak in Midway, Utah, U.S. February 27, 2020. REUTERS/George Frey 

Water Leach Purification (WLP) is pictured at Lynas Advanced Materials Plant in Gebeng, Pahang, Malaysia, July 23, 2019. Picture taken on July 23, 2019. REUTERS/Lim Huey Teng 

Water Leach Purification (WLP) waste site is pictured at Lynas Advanced Materials Plant in Gebeng, Pahang, Malaysia, July 23, 2019. Picture taken on July 23, 2019. REUTERS/Lim Huey Teng 

A worker holds a radiation dosimeter above the Water Leach Purification (WLP) at Lynas Advanced Materials Plant in Gebeng, Pahang, Malaysia, July 23, 2019. Picture taken on July 23, 2019. REUTERS/Lim Huey Teng 

French President Emmanuel Macron gestures as he receives a replica of WWI tank during his visit at water purification industrial project in Charleville-Mezieres, France, November 7, 2018. Francois Mori/Pool via REUTERS 

French President Emmanuel Macron leaves after visiting a water purification industrial project in Charleville-Mezieres, France, November 7, 2018. Francois Mori/Pool via REUTERS 

French President Emmanuel Macron listens to the Algerian CEO of Cevital industrial group Issad Rebrab as he visits a water purification industrial project in Charleville-Meziere, France, November 7, 2018. Francois Mori/Pool via REUTERS 

After a sewage leak caused by Hurricane Michael, foam floats on the Apalachicola River in Apalachicola, Florida, U.S., October 18, 2018. REUTERS/Terray Sylvester 

After a sewage leak caused by Hurricane Michael, a dead fish and other debris float on the Apalachicola River in Apalachicola, Florida, U.S., October 18, 2018. REUTERS/Terray Sylvester 

After a sewage leak caused by Hurricane Michael, a dead fish floats on the Apalachicola River in Apalachicola, Florida, U.S., October 18, 2018. REUTERS/Terray Sylvester 

After a sewage leak caused by Hurricane Michael, foam floats on the Apalachicola River in Apalachicola, Florida, U.S., October 18, 2018. REUTERS/Terray Sylvester 

After a sewage leak caused by Hurricane Michael, dead fish lie on the banks of the Apalachicola River in Apalachicola, Florida, U.S., October 18, 2018. REUTERS/Terray Sylvester 

Members of Germany's NGO organisation ISAR-Germany (International Search and Rescue) get water for purification at a camp in a suburb of Palu, Central Sulawesi, Indonesia, October 8, 2018. REUTERS/Hannibal Hanschke 

People look at members of Germany's NGO organisation ISAR-Germany (International Search and Rescue) (not pictured) as they set up a camp for water purification in a suburb of Palu, Central Sulawesi, Indonesia, October 8, 2018. REUTERS/Hannibal Hanschke 

Members of Germany's NGO organisation ISAR-Germany (International Search and Rescue) set up a camp for water purification in a suburb of Palu, Central Sulawesi, Indonesia, October 8, 2018. REUTERS/Hannibal Hanschke 

Members of Germany's NGO organisation ISAR-Germany (International Search and Rescue) set up a camp for water purification in a suburb of Palu, Central Sulawesi, Indonesia, October 8, 2018. REUTERS/Hannibal Hanschke 

Water pours in Al Bida water tanks project in Basra, Iraq September 12, 2018. Basra residents say salt seeping into the water supply has made it undrinkable and sent hundreds to a hospital. Picture taken September 12, 2018. REUTERS/Alaa al-Marjani 

A cross-section of a ultraviolet disinfection unit used in the water purification process is seen at a NEWater plant in Singapore July 19, 2018. Picture taken July 19, 2018. REUTERS/Edgar Su 

A view of the reverse osmosis system used in the water purification process at a NEWater plant in Singapore July 19, 2018. Picture taken July 19, 2018. REUTERS/Edgar Su 

A view of the reverse osmosis system used in the water purification process at a NEWater plant in Singapore July 19, 2018. Picture taken July 19, 2018. REUTERS/Edgar Su 

A resident passes pipes carrying water from Malaysia to Singapore, near a public housing estate in Singapore July 19, 2018. Picture taken July 19, 2018. REUTERS/Edgar Su 

Pipes carrying water from Malaysia to Singapore are seen near a public housing estate in Singapore July 19, 2018. Picture taken July 19, 2018. REUTERS/Edgar Su 

Residents pass pipes carrying water from Malaysia to Singapore, near a public housing estate in Singapore July 19, 2018. Picture taken July 19, 2018. REUTERS/Edgar Su 

A view of the Marina Barrage, which separates seawater and freshwater, in Singapore July 19, 2018. Picture taken July 19, 2018. REUTERS/Edgar Su 

Workers pass pipes carrying water from Malaysia to Singapore, in Johor Baru, Malaysia July 20, 2018. Picture taken July 20, 2018. REUTERS/Edgar Su 

A view of the reverse osmosis system used in the water purification process at a NEWater plant in Singapore July 19, 2018. Picture taken July 19, 2018. REUTERS/Edgar Su 

An engineer climbs up from the cartridge filter hold where suspended material is filtered out of water before purification at the Pembroke reverse osmosis plant in Pembroke, Malta May 28, 2018. Picture taken May 28, 2018. REUTERS/Darrin Zammit Lupi 

An engineer walks near the cartridge filter hold where suspended material is filtered out of water before purification at the Pembroke reverse osmosis plant in Pembroke, Malta May 28, 2018. Picture taken May 28, 2018. REUTERS/Darrin Zammit Lupi 

Water purification equipment by Emefcy is seen at a school campus in Changzhou, Jiangsu province, China June 20, 2017. Picture taken June 20, 2017. REUTERS/David Stanway 

Water purification equipment by Emefcy is seen at a school campus in Changzhou, Jiangsu province, China June 20, 2017. Picture taken June 20, 2017. REUTERS/David Stanway 

A collapsed wall of a reservoir holding a highly acidic wastewater is seen in Mishor Rotem, in Southern Israel July 4, 2017. REUTERS/Baz Ratner TPX IMAGES OF THE DAY 

A Balinese Hindu woman collects sea water on a beach during Melasti, a purification ceremony ahead of the holy day of Nyepi, in Gianyar, Bali, Indonesia March 25, 2017. REUTERS/Agung Parameswara 

A Balinese Hindu woman hold her grandson's hand on a beach during Melasti, a purification ceremony ahead of the holy day of Nyepi, in Gianyar, Bali, Indonesia March 25, 2017. REUTERS/Agung Parameswara TPX IMAGES OF THE DAY 

A Balinese Hindu priest sprinkles water on people praying on a beach during Melasti, a purification ceremony ahead of the holy day of Nyepi, in Gianyar, Bali, Indonesia March 25, 2017. REUTERS/Agung Parameswara 

Water purification tablets are seen in a health center during a water drought season in Chasquipampa, La Paz, Bolivia, November 28, 2016. REUTERS/David Mercado 

Republican presidential nominee Donald Trump tours the Flint Water Plant & Facilities in Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

Republican presidential nominee Donald Trump gestures as he leaves a tour of the Flint Water Plant & Facilities in Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

Republican presidential nominee Donald Trump tours the Flint Water Plant and Facilities with JoLisa McDay, Utilities Administrator for the City of Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

U.S. Republican presidential nominee Donald Trump listens to his press secretary Hope Hicks as he tours the Flint Water Plant and Facilities in Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

Republican presidential nominee Donald Trump tours the Flint Water Plant and Facilities with JoLisa McDay, Utilities Administrator for the City of Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

Republican presidential nominee Donald Trump tours the Flint Water Plant and Facilities with JoLisa McDay, Utilities Administrator for the City of Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

U.S. Republican presidential nominee Donald Trump tours the Flint Water Plant and Facilities with JoLisa McDay, Utilities Administrator for the City of Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

U.S. Republican presidential nominee Donald Trump tours the Flint Water Plant and Facilities with JoLisa McDay, Utilities Administrator for the City of Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

U.S. Republican presidential nominee Donald Trump tours the Flint Water Plant and Facilities with JoLisa McDay, Utilities Administrator for the City of Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

U.S. Republican presidential nominee Donald Trump tours the Flint Water Plant and Facilities in Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

U.S. Republican presidential nominee Donald Trump tours the Flint Water Plant and Facilities in Flint, Michigan, U.S., September 14, 2016. REUTERS/Mike Segar 

A devotee offers prayers standing in the Bagmati River flowing through the premises of Pashupatinath temple during the Janai Purnima, or Sacred Thread, Festival in Kathmandu, Nepal, August 18, 2016. Hindus take holy baths and change their sacred thread, also known as Janai, for protection and purification, during the festival. REUTERS/Navesh Chitrakar 

Sewage and rainwater flows on the side of an informal Syrian refugee camp under power lines and poles in the Bekaa valley, Lebanon March 15, 2016. REUTERS/Mohamed Azakir 

A Syrian refugee girl walks on a wooden plank over sewage water inside an informal Syrian refugee camp in Tirbol village, Bekaa valley, Lebanon March 10, 2016. Picture taken March 10, 2016. REUTERS/Mohamed Azakir TPX IMAGES OF THE DAY

A Balinese Hindu collects seawater during Melasti, a purification ceremony, ahead of the holy day of Nyepi, in Gianyar on the Indonesian resort island of Bali, March 6, 2016. Nyepi is a day of silence to celebrate the Balinese new year, reserved for self-reflection, where people are not allowed to use lights, light fires, work, travel or enjoy entertainment. REUTERS/Roni Bintang 

A Balinese Hindu collects seawater during Melasti, a purification ceremony, ahead of the holy day of Nyepi, in Gianyar on the Indonesian resort island of Bali, March 6, 2016. Nyepi is a day of silence to celebrate the Balinese new year, reserved for self-reflection, where people are not allowed to use lights, light fires, work, travel or enjoy entertainment. REUTERS/Roni Bintang 

A man performs ablution using water at an old fountain before performing prayers in the old city of Algiers Al Casbah, Algeria December 3, 2015. The Algiers Casbah is a UNESCO World heritage site that includes the Sidi Ramdane mosque and former fortress, 10 centuries old. Decay from the passing years, as well as earthquake damage in 2003, leads some to consider a move to modern apartments with financial backing from the government. Others refuse to leave a neighbourhood they have called home for decades. Picture taken December 3, 2015. REUTERS/Zohra Bensemra 

Large pumps (foreground) force water through filters in the first stage of desalination at the Carlsbad Desalination plant in Carlsbad, California, December 14, 2015. REUTERS/Earnie Grafton 

Sea water is forced through filters in the Reverse Osmosis building at the Carlsbad Desalination plant in Carlsbad, California, December 14, 2015. REUTERS/Earnie Grafton 

View of the Carlsbad Desalination plant in Carlsbad, California, December 14, 2015. REUTERS/Earnie Grafton 

Huge pipes weave through the newly completed Carlsbad Desalination plant in Carlsbad, California, December 14, 2015. REUTERS/Earnie Grafton 

An escort awaits his tour group during tour of the Carlsbad Desalination plant in Carlsbad, California, December 14, 2015. REUTERS/Earnie Grafton 

A tour guide walks past the filters in the Reverse Osmosis Building during tour of the Carlsbad Desalination plant in Carlsbad, California, December 14, 2015. REUTERS/Earnie Grafton 

Huge pipes wind throughout the Carlsbad Desalination plant in Carlsbad, California, December 14, 2015. REUTERS/Earnie Grafton 

Los Angeles Mayor Gil Garcetti listens to Marcie Edwards, General Manager of Los Angeles Department Water and Power, speak during a ceremony to break ground on the Terminal Island's Advanced Water Purification Facility in the San Pedro section of Los Angeles, California, April 22, 2015. REUTERS/Bob Riha Jr