Lighted Water
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nitelighter ultra under water pool light FOR ABOVE GROUND POOL $65.00 |
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15 Ostrich Feather White 16-19″ + 50g Water Pearl + 2 LED Submersible light $55.99 |
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New Faucet Glow Shower LED Light Bulb Water Flow Temperature Sensor Colorful $0.01 |
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Cozy 3 Colors LED Light Shower Head Water Bathroom sprinkler $0.99 |
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New S/B Chevy light weight aluminum short water pump $79.95 |
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30 Ostrich Feather White 16-19″ + 100g Water Pearl + 4 LED Submersible light $112.99 |
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Water and Light: Looking Through Lenses (Science All Around .. – Library Binding $2.49 |
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3 Colors LED Faucet Sensor Water Glow Light Temperature Shower Tap $5.00 |
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New Summer Aqua Water Sports Mens Shoes Light Sponge shoes BL-A Size US 9 $9.90 |
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New Automatic 7 Color Changing LED Light Bath Shower Head Water Faucet Sprayer $1.56 |
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4.5″ 4in1 WHITE 11K RPM TACHOMETER w/OIL PRESS. WATER & OIL TEMP+SHIFT LIGHT_P1 $32.99 |
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New Summer Aqua Water Sports Mens Shoes Light Sponge shoes BL-A Size US 9 $9.90 |
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Joe’s Women’s Casual Light Blue Water Wide Leg Trouser Pant SZ 30 $45.00 |
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Portfolio Outdoor Wall Lantern Porch Light 0203290 Dark Oil Rubbed + Water Glass $49.99 |
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RAB WP2H175 HEAVY DUTY, WATER PROOF 175 WATT MH W/LAMP, WALL PACK LIGHTING!!!! $75.00 |
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TABLE TOP WATER FOUNTAIN Mini Wildwood Cascade W/ LIghts Inside or outside New! $92.99 |
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2 Illuminx Water Glow LED Faucet Lights Temperature Sensor Know When Hot or Cold $4.99 |
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12.2in 12 LED Fish Water Tank Aquarium Colorful Bubble Air Curtain Lighting $0.69 |
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NEW NWT CROCS FINN SEA BLUE / LIGHT GREY 8/9 tdlr clogs water mesh shoes $25.51 |
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NEW NWT CROCS FINN SEA BLUE / LIGHT GREY 6/7 tdlr clogs water mesh shoes $14.99 |
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Water Glow 7 Colors LED Light Faucet Light Sink Tap Nice for Kitchen Bathroom $0.21 |
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Nice Water Proof 57 LED 47.5cm 1.56ft Blue Aquarium Turtle Fish Tank LED Lights $0.33 |
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URBAN ROAD WARRIOR AUTO CAR KIT EMERGENCY JUMPER CABLES WATER SPOT LIGHT AA01 $78.99 |
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White w/ light Pink/Peach Color Accents Decorative Water Pitcher USA $8.99 |
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New Water Resistant 4 LED 6″ Mini Camping Light $4.42 |
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Wet Light Water Base Personal Lubricant Lube Latex Safe $12.95 |
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Outdoor Sports Bicycle Bike Light Weight water bottle cage White-Blue+Screw $0.99 |
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Fashion Golden Chain Water Drop Light Orange Resin Beads White Pearl Necklace $8.99 |
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Cozy 3 Colors LED Light Shower Head Water Bathroom sprinkler $0.99 |
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Universal Smart Automatic 7 Colour LED Shower Head Bathroom Water Faucet Light $0.77 |
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#16R Royal Robbins light green Water board shorts Women’s size 16 EUC $4.99 |
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Nike Cross Training Watch Sport Analog Water Resistant With A Light $15.00 |
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1941 Pittsburgh Water Street photo Union metal light ad $8.49 |
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Life-Like Town Church + Lighted Yard Tower & Shanty W/ Water Tank & Windmill $17.95 |
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Tacx Tao Light Water Bottle Cage White $17.91 |
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Men’s Rip Curl Surf Watch Water Resistant Date & Light Very Nice!! $45.00 |
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Water Resistant Aquarium Fish Tank White LED Lights 57 LED $9.99 |
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KEEN Newport H2 light green sport water SANDALS toddler boys girls EU 28 US 10 $20.50 |
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Fashion Golden Round Light Brick Water Drop Resin Beads Stud Dangle Earrings $5.99 |
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Glow LED Light Water Faucet Tap Automatic 3 Colors RGB Need NO Battery $5.99 |
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2pcs Glow LED Light Water Faucet Tap Automatic 3 Colors RGB Need NO Battery $11.12 |
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Glow LED Water Faucet Shower Light Colors Tap Temperature Sensor $0.99 |
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Water Glow Light LED Shower Head with Temperature Controlled RGB 3 Colors Change $13.85 |
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WOMENS LIGHT CREME SIZE XLARGE PINK WATER PUMP PRINTED CREW NECK T SHIRT $3.50 |
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Cozy 3 Colors LED Light Shower Head Water Bathroom sprinkler $0.99 |
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Romantic 15-LED Light Water Bathroom Shower Head RGB A8 $3.99 |
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BATTERY-FREE! Water-Activated LED Neon Faucet Tap Night Light 007 Nite Lite Up $9.99 |
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18in 18 LED Fish Water Tank Aquarium White Bubble Air Curtain Lighting $4.69 |
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New Summer Aqua Water Sports Mens Shoes Light Sponge shoes BL-A Size US 9.5 $9.90 |
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Water Glow Shower LED Faucet Light Temperature Sensor $4.99 |
How Ultraviolet (UV) Light Water Filters Work
Using ultraviolet (UV) light to purify drinking water is a concept that has existed for more than one hundred years. Despite its early beginnings, the science behind UV disinfection is complex. Understanding the fundamentals of how UV is able to purify drinking water requires a relatively deep understanding of physics, chemistry and biology.
The average consumer of this technology rarely has the science background to fully grasp how a “light in a pipe” will be able to protect a water supply from dangerous microorganisms. This often leads to consumer frustration which in many cases is exacerbated by faulty information provided by ill-equipped salespeople.
Often the outcome of this frustration is consumer inaction which is unfortunate because UV systems are an extremely effective and relatively inexpensive way to purify drinking water. The goal of this article is to explain, as simply as possible, the science behind the disinfection of drinking water using ultraviolet light.
UV light refers to wavelengths of light that exist between visible light and x-rays on the electromagnetic spectrum. UV can be broken into three subcategories: UV-A, UV-B, and UV-C. UV-A and UV-B are probably the best known of the UV wavelengths since they are responsible for giving us a suntan or sunburn. UV-C light is a much higher energy and much more damaging form of UV light. It is UV-C that is used in an ultraviolet light water purification system.
As mentioned above, UV-C is a very powerful and very damaging form of ultraviolet light. When a living cell is exposed to UV-C, specifically the 254nm (nm = “nanometer”) wavelength, the light is able to penetrate through the cell and damage the DNA of the organism.
DNA, or deoxyribonucleic acid, is responsible for directing the activities within all living cells. All cells must have intact DNA in order to function properly. The structure of DNA is very similar to a ladder that has been twisted from both ends resulting in a spiral staircase appearance. It is sometimes referred to as a “double helix” since all DNA is actually comprised of two molecules. You can think of each side of the ladder as one molecule and the rungs of the ladder as the connection points between the two.
When cells reproduce, the end result is two identical cells each with a functional copy of DNA and all of the other necessary structures for the cell to function. This is true of the cells in humans, other animals, plants, and the bacteria and viruses that might be found in drinking water. So at some point in the cell replication cycle the DNA must be copied also.
When DNA replicates there is a special protein that travels the length of the DNA and splits it in half. Using the ladder analogy, this protein travels down the ladder and splits each rung. The result is two separate molecules that each resembles one side of a ladder. In normal DNA replication the protein travels down the ladder and as each rung is split each side is quickly rebuilt. The result is two identical strands of DNA – one for each of the resulting cells.
UV-C light has the ability to penetrate through the cell and attack the DNA. It actually fuses some of the rungs of the DNA ladder together. Recall above that during DNA replication a protein travels along the ladder and splits each rung. When the DNA of a cell has been exposed to enough UV-C light and some rungs have been fused, the protein responsible for splitting the replicating DNA can’t do its job. When it encounters a fused rung it just stops, and the DNA replication stops with it. This prevents the cell from being able to reproduce. A bacterial or viral cell that cannot reproduce is not capable of causing infection. That statement bears repeating: if a bacterial or viral cell cannot reproduce, it cannot make us sick.
So, UV light does not “kill” microorganisms – it simply makes it impossible for them to reproduce, rendering them harmless to anybody that might ingest them in a drink of water. It is critical that the DNA of the organism is exposed to enough UV light in this process. When discussing UV water purification systems, the amount of UV light is usually called dose. UV dose is simply the amount of UV light an organism is exposed to as it travels through an ultraviolet water purification device. The good news about UV is that it takes relatively little exposure for a microorganism to be inactivated, and it’s impossible to over dose UV light.
Because of differing water conditions and in order to purify different water flow rates, UV manufacturers produce different sized models of UV water filter systems. For higher flow rates, a longer UV lamp is required. This is simply to ensure that an adequate UV dose is being applied. For slower flow rates a shorter UV lamp can be used since the water being treated resides in the UV system for a longer period of time.
About the Author
C. Reid Thornley is a B.Sc. Biology and a former research associate for a world class water purification manufacturer. He has been a presenter for the US Water Quality Association and he now owns and operates
aQuatell – Water Purification Made Easy!
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Ayala Mall Lighted Water Fountain.flv