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What are the effects of UVA, UVB and UVC on water, microorganisms and health?

Verre d'eau

All these happy photons are part of the spectrum, they are electromagnetic waves, but we can't see them in our eyes. They are at the bottom of the spectrum, opposite to infrared.


Let's start with the richest, and so far UV-A accounts for 5 percent of solar radiation. They are harmless, but they can help fight skin disease. In general, they are essential for our balance, which can cause only slight skin swelling after exposure for a few hours. Exposure to more than a few hours a day is not recommended, although its long-term hazards are not clear.

They are widely used in industrial products: glue polymerization, printing and screen printing drying, nail polish drying and polymerization, nightclub fluorescent lamp, etc.

Purify your tap water with UV-A from LaVie

bouteille purificatrice d'eau LaVie pure

LaVie UV-A water purifiers® work without filters or maintenance and allow you to purify your tap water in 15 minutes.

They use an innovative technology, patented and exclusive to LaVie®: the photolysis of chlorine by UV-A radiation.

This treatment allows the removal of chlorine and its derivatives, chemical compounds such as certain pesticides or traces of medication, and tastes and odours that can be found in tap water.

The result, which is very qualitative, makes it possible to draw a definitive line on the consumption of water in plastic bottles.

The carbon footprint linked to the manufacture of the aluminium tube of the UV water purifier is neutralised in a few days of use compared to the equivalent consumption of water in plastic bottles.


UV-B is clearly a high-dose carcinogen, or because of skin cancer cases, the sunburn room regulations are becoming more and more stringent. They are the culprit of sunburn, and fragile skin can burn in just 30 minutes.

The atmosphere filters most of it, allowing us to safely ground against the noon sun.

They rarely appear in commercial products except for some reptiles and tanned huts.


UV-C is deadly to humans and almost all living things on earth. There is no step by step on earth because they are blocked by the ozone layer (let's hope it stays there, or we have to live underground...).

Humans can make them with mercury lamps or light-emitting diodes, mainly because of their impact on bacterial DNA.

Learn more about UVs:https://fr.wikipedia.org/wiki/Ultraviolet

UV and water

So let's focus on water and the creatures that don't need it.

UV-C is used for sterilization, which can affect the DNA of bacteria and mutate it. This will stop bacteria from splitting.

If you drink a glass of water containing UV C scintillating bacteria, you will drink them, most of them live, but make sure they do not reproduce during digestion. So you will be "saved," but you will not improve the taste, smell or physicochemical aspects of the water. That's why we talk about sterilization (again, to kill bacteria, we need to triple the dose, and for some viruses, it's 10 times more.)

So if you want to drink lake water or river water, as long as it doesn't contain chemicals, pesticides, micro drugs, etc., you can buy a bottle of UV-C...

Some brands record them as water purifiers, which is totally wrong. In particular, the bad taste and odor in tap water are mainly caused by 500 chlorine by-products, some of which are known carcinogens, which are not affected by UV-C "flash".

In fact, the main participants in water use UV-C because they react very quickly, but at the end of the treatment, before chlorination passes through the public system.

But when I saw the French company installing led UV-C treatment equipment under the sink for 1300 euros, I yelled: in France, there are no bacteria in tap water, it's no use trying to eliminate them

It's as bad as buying a water softener (1000 euros, highly polluting) to improve the taste of the water: who wants to drink salt water through resin and plastic to avoid absorbing calcium?

So, one last reminder, UV-C can't "purify" water unless you believe that purification means killing a bacterium and drinking it, and I'll let you come to the conclusion.

In the SODIs (solar disinfection) process developed by EWAG, UV-A is widely used because of its bactericidal properties. Plastic bottles are exposed to sunlight for several hours to remove pathogens, which greatly reduces the incidence of diarrhea.

Solar water disinfection, also known as SODIs (for solar disinfection), is a method that only uses solar energy and polyethylene terephthalate (PET) bottles to disinfect water Source: Wikipedia

Our solution

Lavie water purifier

Find in Our store New generation water purifier Lavie(2) Sustainability and environmental protection, they work No consumables, 10 years. 


UV-B is rarely used in water treatment because plastics and glass are opaque.

So what's the difference between the patented Lavie process?

The use of UVA as a bactericide is not patentable, because for decades, we have been well known to technical personnel, so we have applied for many other patents.

Fasten your seat belts and we will dive in this great innovation. We need to quickly explain what advanced oxidation processes are, including Ravi It's one of them.

The technology is simple: an active substance is released into water (in the most common process, oxidized water, or H2O2) and then destroyed by ultraviolet photons. The explosion produces free radicals, which, by bouncing back, break down anything that's not water into simple elements.

Advanced oxidation process (POA) is a set of chemical treatment process, which aims to destroy suspended or dissolved organic matter (sometimes inorganic matter) in domestic, urban or industrial wastewater. Oxidation by reaction with hydroxyl radical (Ho ·) Source: Wikipedia

Water companies use these very expensive processes to remove persistent substances in wastewater: female hormones (β - estradiol in contraceptives), endocrine disruptors, pesticides, trace drugs, etc.

However, no one thought of using this method to treat tap water, let alone using UVA instead of UV-C, let alone using chlorine in tap water as active substance.

Therefore, we have created the first domestic advanced risk-free oxidation process with the same efficiency as our ancestors. Therefore, the novelty lies in the use of UVA radiation to scintillate chlorine in tap water. UVA radiation is converted into oxidation free radicals (O, O3, H2O2, H -, Cl -), thus reducing the surrounding chemical substances to by-products, thus increasing the oxidation capacity of chlorine by 10 million to 1 million times and making it disappear, You should think about it.

By the way, living bodies (bacteria, viruses, etc.) are covered with holes created by these intense exchanges and cannot live or come out piece by piece.

Let's conclude: avoid UV-C products if you are not a wild camping enthusiast or a resident of the Philippines, do not expose yourself too often and too long to the sun for your health, prefer its indirect light, and remember that the pollutants of wastewater are appearing in drinking water, because guess or is being released from the treatment plants (if , in rivers, rivers or groundwater... which we then consume in the form of bottled water or tap).

Thus, protecting yourself from micro-pollutants can probably be interpreted as a precautionary principle, but would you think about drinking drugs or pesticides, even in very small quantities?

Insecticides in tap water

There are still too many pesticides in tap water. Source:Generations

Similarly, do you think that drinking chlorine, a biocide in tap water, has no effect on the bacteria in your windpipe?

You are "consumactive" and it is up to you to judge.


  • Bonjour Franck Juret,

    Je maintiens bien sur que les UVA sont inoffensifs pour la santé, sous réserve de ne pas dépasser la dose que peut encaisser notre peau. dans notre cas, nous disposons d’une certification d’innocuité effectuée par SGS qui nous classe dans les dispositifs que peux regarder fixement un enfant pendant trois heures, je pense que cela suffit à le prouver.
    Avec un peu de bon sens, tous les travailleurs en extérieurs seraient morts à l’heure qu’il est si les UVA émis par la lumière solaire étaient aussi dangereux que ce que vous le citez. Encore une fois, et comme dans l’alimentation, tout est une question de dose. On peut aussi dire que vivre ou respirer l’air des montagnes tue, mais cela reste globalement faux, l’humain à simplement une durée de vie limitée. Notre mission est de prolonger sa vie en bonne santé grâce à une eau de qualité, et de préserver l’environnement des montagnes de plastique que nous lui déversons quotidiennement.
    Mon propos à propos de l’innocuité des UVA tend à démontrer qu’il est inoffensif par rapport aux UVB qui font des trous dans la peau, ou des UVC qui sont létaux pour l’homme. Je n’ai nulle intention de parler en langage scientifique, qui ferait fuir tout lecteur n’appartenant pas à ce collège. Mais je vous remercie pour avoir apporté cette précision.

    Pascal Nuti
  • Bonjour,
    Actuellement en recherche documentaires sur les effets néfastes du rayonnement ultraviolet, je me permet de vous laisser ce commentaire. Vous ne pouvez pas écrire que les UVA sont inoffensifs! Il est vrai que si paradoxalement ils sont utilisés en photothérapie, ils sont en revanches responsables à long terme du vieillissement cutané et de cancer de la peau comme les mélanomes.

    Franck JURET
  • Bonsoir Pascal,

    Les bouteilles en verre de 1.5l et 2l sont malheureusement trop lourdes pour être manipulées par chacun, voire trop larges aussi. D’autres solutions arriveront plus tard dans l’année, toujours en mode zéro plastique !

    Pascal Nuti
  • Actuellement en phase de test, j’aime bien jouer avec les 3 couleurs. Pour l’instant, le bleu du milieu s’impose, mais on verra à l’usage. Pourquoi pas des bouteilles de 1.5 voire 2 litres avec un émetteur de uva dont le diamètre s’adapte (et la durée aussi) ? En tout cas, bon début 😊

    Pascal Piot
  • Merci pour votre retour Olivier ! Il est en effet essentiel de goûter la différence pour se rendre compte de l’efficacité de notre système 😉
    Ravi que vous soyez pleinement satisfait de votre expérience gustative : je vous invite à utiliser notre programme de parrainage afin d’être récompensé pour la pub que vous réalisez auprès de votre entourage : https://lavie.bio/pages/share
    Bonne dégustation !


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