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A water osmosis unit, for what use?

Today, we're going to discuss the usefulness of this device that can be found just about everywhere, and that uses reverse osmosis technology.

The recurring costs of a water osmosis unit

On the current market of products sold to improve water quality, we find constantly proposals with recurring income.

Water filters, water softeners, osmosis machines and many others, make us buy consumables on a regular basis.

The same applies to mineral water manufacturers, which are always recurring purchases.

To illustrate this further, let's take a look at a basic offer, which can be found on the market for around 250€. You should know that a machine costs more than 1500€, so it is a "first price".

Osmoseur d'eau

Basic osmosis without remineralization

So, let's detail: a pre-filter type sediment filter, a reverse osmosis membrane guaranteed to last 24 months at 70€ replacement, a post-filter type activated carbon, a 6l tank, and a low flow faucet.

If you can install it by yourself, great, if not double the price of the device to include installation, which is closer to 500€ installed.

The manufacturer claims its membrane lasts 2 years, yet in comments read on a major retail site, a customer mentions that the actual duration is divided by two, or one year.

Let us summarize, it is necessary to change the filters every six months, that is to say 100€ per annum, and 70€ of membrane, that gives on three years: 500+300+210= 1010€, and you will continue to pay annually 170€, provided that your water is not too "hard", because in this case, the manufacturer recommends to you to add a water softener before the osmosis system.

Beyond a water hardness of 15°f, it is strongly advised to install a water softener in order to prolong the life of the system and to protect it from limestone

Ok, we get it, it's expensive, and capricious, and basically, it does the job of a carafe filter with a 6L tank, but then, what's the benefit?

The alternative solution to water osmosis: LaVie!

carafe filtrante lavie

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 removes 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.

What are the health benefits of water osmosis?

None if your water is drinkable, the only benefit is to remove the salt that the softener would have added. An osmosis unit is a product for space stations or ships, as it allows to recycle salt-laden water, or urine, for example. But since salt is regulated in drinking water, there is no need to osmose tap water.

Basically, it produces ultra-processed water, "dead" in the sense of minerals and its dissolved oxygen, and unfit for consumption, therefore undrinkable. Drinking water must contain at least calcium and magnesium in regulated quantities, of which this device will have extracted 80 to 90% through its membrane.

Drinking water (WHO) should have a neutral pH value of between 7 and 8, ideally 7.5, but your osmosis machine will produce acidic, corrosive water at a pH value of around 6, just like a carafe filter.

Drinking water contains little or no bacteria, but the 6l tank, as well as the tap, devoid of the chlorine which protected the water from any contamination will quickly serve as a nest for these little beasts (always as for the filtering carafes, especially as the storage in the case of the osmosis is at 20°C, even 30°C in summer, a temperature very favourable to bacterial development).

And do not believe that the osmosis membrane removes chlorine, because it does not support it, it is the pre-filter which makes this work, to avoid "frying" the membrane too quickly.

Of course, some more expensive models include mineralization cartridges (calcium and magnesium), another excellent method to catch a few more bacteria, and why would you want to put back into the water artificially what was naturally there at the beginning?

You can push the envelope further, and this is what is practiced in the big machines of big French companies with the "bio" label (hey yes they sell you ultra processed water on the spot, in plastic bottles, but you mustn't throw them in the wrong bin...), and put back the lost dissolved oxygen with the help of a vortex, but are you really sure you still want to drink this water?

This is a far cry from natural water, quite the opposite.

In these very expensive machines, there is also a UV-C flash at the outlet, not to kill bacteria, but only to prevent them from reproducing in your stomach, and many other pre or post filters that I will not detail here, because they will not be found in a domestic machine.

The environmental impact of water osmosis machines

Let's detail the environmental impact: Four filters and a non-recyclable membrane per year, and more than 60% of the input water that goes into the environment as concentrated soup. You will of course pay for this wasted water in your bill.

Still want to get a reverse osmosis system? Test our LaVie system first, we work miracles on water with a high mineral content, and you can return the product if it doesn't work for you. There is no installation, no filter to change, no bacterial pollution to worry about, no trace of chlorine or bad taste.


  • Une eau riche en nitrates n’est pas dangereuse, le seuil de 50mg/l fixé par la France n’est pas basé sur des preuves scientifiques.
    Bien que les nitrates soient peu recommandés pour les nourrissons (un maxi de 15-20mg/l pendant les premiers mois semble sage) , ils sont un bienfait pour l’humain. En effet, ils permettent de mieux fixer l’oxygène dans le sang, de faire baisser la tension, de mieux résister à l’effort etc… Une seule betterave représente huit fois cette quantité (450mg) de nitrate, et personne n’à jamais déclaré la betterave dangereuse, bien au contraire.

    Pascal Nuti
  • Bonsoir Jean-François,

    Je ferais la même réponse qu’au dessus : on ne peut pas considérer l’eau “hydrogénée” comme autre chose qu’un traitement temporaire, qui est par ailleurs relativement controversé. Les avis de personnes qualifiées oscillent entre charlatanisme et possible effets ponctuels en cas de pathologie particulières. J’en resterais personnellement éloigné par principe de précaution, car il y plus de controverses à ce sujet que d’études claires et lisibles.

    Pascal Nuti
  • Bonjour,
    Pour une eau riche en nitrate (68mg/l), que peut on utiliser pour la rendre buvable sur le long terme ?

  • Bonjour Jean-François,
    Quand je vois des ondes de forme associés à de l’eau hydrogénée dans la même phrase, et des prix à 500€ au lieu de 50€ (le vrai prix sur AliExpress par exemple : https://fr.aliexpress.com/item/32953251311.html? )
    J’en déduis déjà que je dois me méfier.
    Notre bouche et trachée, jusqu’à l’estomac, sont en pH neutre. J’en déduis que mettre de l’eau acide ou basique tout le temps n’est pas recommandé par dame nature.
    Par ailleurs, aucun test scientifique ne démontre proprement les bienfaits cette eau basique tous les jours.
    Tout au plus, des gens censés recommandent de ne pas dépasser trois mois de “cure” pour certaines pathologies, mais sans vrai point d’appui scientifique.
    Comme pour tous les miroirs aux alouettes, j’en resterais éloigné, à votre place. J’ai personnellement testé, et je n’y ai trouvé aucune amélioration justifiable.
    Belle journée

    Pascal Nuti - LaVie

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