{"id":7791,"date":"2026-05-20T12:16:11","date_gmt":"2026-05-20T10:16:11","guid":{"rendered":"https:\/\/drinkatering.com\/?p=7791"},"modified":"2026-05-20T19:22:07","modified_gmt":"2026-05-20T17:22:07","slug":"reverse-osmosis","status":"publish","type":"post","link":"https:\/\/drinkatering.com\/en\/osmosi-inversa\/","title":{"rendered":"Osmosi inversa: cos’\u00e8, come funziona e quando serve davvero. Guida tecnica per una scelta senza sprechi"},"content":{"rendered":"

Summary
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Reverse osmosis is often cited as the ultimate water purification technology, capable of making almost any liquid drinkable. But is it always the right choice for the home, office or restaurant? In this technical article, we explain how the semi-permeable membrane works, analysing the pros (removal of heavy metals and pollutants) and cons (demineralisation, water wastage and acidity). DKR guides you in understanding this powerful technology, explaining when it is essential and when, on the other hand, microfiltration may, in some cases, be a more logical and sustainable choice. In the vast landscape of water treatment, few technologies are as well-known and discussed as reverse osmosis. Often sold as a panacea for every water problem, it is sometimes commercially presented as the only way to have \u201cpure water\u201d. Unfortunately, the industry is affected by some retailers who adopt a non-neutral approach, trying to sell the most expensive product instead of the most useful one; this harms the entire market and confuses the end customer, despite the efforts of trade associations such as AIAQ, Acqua Italia and Amitap to promote correct commercial ethics.<\/p>\n\n\n\n

However, as we have often reiterated in our technical column, at DKR (which produces dispensing systems and not filtration systems) we do not believe in universal solutions. For this reason, we strive to be neutral in the description and use of these technologies, availing ourselves of the opinion of external experts, such as Mr. Danilo Turola of the company Filtra, a reality specialising in water treatment founded in 1999 with roots going back to the \u201970s, now in its third generation and part of a group capable of covering the water treatment market 360\u00b0.<\/p>\n\n\n\n

To respond, we must abandon the slogans and delve into fluid mechanics and chemistry.<\/p>\n\n\n\n

What it is and how it works: physics beyond the filter<\/strong><\/h2>\n\n\n\n

To understand reverse osmosis, one must first understand natural osmosis. In nature, if we bring two liquids with different salt concentrations into contact, separated by a semi-permeable membrane (which allows water to pass but not salts), water tends to move from the less concentrated solution to the more concentrated one to dilute it and equalise the salinity.<\/p>\n\n\n\n

Reverse osmosis reverses this natural process by applying an external force.
Through a high-pressure pump, water with a high concentration of mineral salts is pushed against a synthetic membrane with very small pores (in the order of 0.0001 microns). The pressure overcomes the natural osmotic resistance and forces the pure H2O molecules to pass through to the other side, leaving behind almost all of the dissolved substances (salts, metals, bacteria, viruses).
The result is the separation of the flow into two paths:<\/p>\n\n\n\n

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  1. Permeate: purified (reverse osmosis) water with a very low fixed residue.<\/li>\n\n\n\n
  2. Concentrate (or reject): water laden with pollutants and salts that is discharged into the drain.<\/li>\n<\/ol>\n\n\n\n

    The advantages: when the barrier is total<\/strong><\/h2>\n\n\n\n

    Reverse osmosis is, technically, the most advanced filtration method available domestically and industrially. Its advantages are objective in critical situations:<\/p>\n\n\n\n