What is domestic reverse osmosis?

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When we talk about domestic reverse osmosis we mean all those devices that we install at home and that serve to purify water through the physical principle of reverse osmosis. By this principle, when in a set formed by two liquid means separated by a semipermeable membrane, a pressure is applied to the more saline environment, the water molecules cross the said membrane, but not the rest of the molecules and larger particles, which they stay in that more saline environment. In this way it is possible to reverse the natural process of osmosis, which occurs in the opposite direction to the one mentioned, and we finally get a means where we will only find the purest water. The pressure necessary to achieve this process in domestic osmosis facilities is obtained from the pressure of the drinking water network of our house. Of course, it is necessary that the pressure of the network is in a certain range: between 3 and 5 kg / cm2 or bars; However, this is not usually a problem, as it is usually the pressure we find in homes.

Operation and most used devices
The operation of these household devices is, as we have seen, simple. They use water at a certain pressure, which must pass through some filters: the water that passes through them no longer contains the impurities and they remain retained in the filters, which we must change from time to time. As for osmosis devices or models, there are many types on the market, mainly depending on the number of filters they carry. The most common system has 5 filters or stages: 3 prefilters to capture the largest particles, chlorine and other substances; the osmosis membrane, which is the heart of the system; and a post filter that removes residual taste, smell and some organic pollutants. They also carry a reservoir to store filtered water. They are usually placed under the sink and virtually take up all the space under it. They have a tap that must be installed next to the kitchen faucet and that will be the one that dispenses the osmotic water. If you want to know if they are effective, look at the page of does osmosis work well ?.

how reverse osmosis works 5 stages
Reverse osmosis equipment five stages without pump.

Uses of osmotic water
Osmotic water can be used for drinking, although you can also use it for other purposes, such as cleaning food. The daily production of osmotic water of these devices is more than enough for the previous uses, since it is usually around 190 liters per day – 50 gallons / day -, although it is true that the flow rate that flows through the tap is small, around 1 liter per minute, unlike a regular kitchen faucet, which can be six times larger. In addition, that small flow will leave as long as the water reservoir (about 7 liters) has reserves, and once this is finished, only a thread of water will come out. The deposit is refilled in about an hour.

Maintenance
We cannot finish this page dedicated to the description of what is the domestic reverse osmosis without at least making a brief review of the maintenance of the equipment, although you can find much more detailed information on the maintenance page. Thus, comment that, like any other type of filtration technology, industrial reverse osmosis system require regular maintenance. That includes periodically changing the prefilters – once a year -, the postfilter – once every two years -, and the membrane – once every 3 years -, in addition to sanitizing each of the changes.

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