How Does Reverse Osmosis Water Filter Work?

Reverse osmosis membrane treatment

What is a reverse osmosis water filter? A reverse osmosis water filter is a device that filters water through a semipermeable membrane. In a reverse osmosis water filter, water is pushed through a semi-permeable membrane through high pressure, allowing only water molecules to pass through while intercepting impurities, microorganisms, heavy metals, and other harmful substances on one side. Through this process, reverse osmosis water filters can efficiently remove contaminants and impurities from the water, providing clean, pure drinking water.

How reverse osmosis water filter works

The working principle of reverse osmosis water filter is based on the separation technology of a semi-permeable membrane. Normally, there are many dissolved substances in water, such as salts, minerals, organic matter, etc. The molecular size and charge of these substances affect their ability to pass across the membrane. Reverse osmosis water filters work by applying pressure to move water through a space separated by a semipermeable membrane to separate impurities and contaminants from the water.

Specifically, a reverse osmosis water filtration system works as follows:


A reverse osmosis water filtration system must first treat the water entering the system. Typically this involves some pre-treatment steps such as settling, filtration, or softening.


Before entering a reverse osmosis water filtration system, the water is first filtered to remove any large particles of impurities.

pressure pump

The pretreated water enters the pressure pump in the reverse osmosis water filtration system equipment. A pressure pump generates high pressure to push water across the semipermeable membrane.

semipermeable membrane

After passing through the pressure pump, the water flows through the semipermeable membrane. A semipermeable membrane is a special membrane with a very small pore size. Materials on the membrane will pass through with the water flow, and materials that are small enough will penetrate the membrane, while materials that are larger than the pore size will be retained on the semi-permeable membrane.

collection trough

The clean water filtered through the semi-permeable membrane will flow through the collection tank and become the outlet of the reverse osmosis water filtration system. At the same time, the concentrated water filtered by the semi-permeable membrane will flow back into the waste water tank to restart the filtration cycle.

Application areas

Reverse osmosis water filter is a high-efficiency water purification equipment widely used in the following fields:

1. Household water: Household reverse osmosis water purifiers can effectively remove impurities, heavy metals, bacteria, and other harmful substances in tap water, allowing family members to enjoy high-quality drinking water for drinking, cooking, washing, and other purposes.

2. Commercial water: Commercial reverse osmosis water filters are widely used in restaurants, hotels, office buildings, and other places to ensure safe and healthy drinking and domestic water for customers and employees.

3. Industrial water: Reverse osmosis technology is widely used in the industrial field and can be used for water quality treatment in industrial production processes such as electronics, pharmaceuticals, chemicals, and beverages to ensure water quality requirements in the production process.

4. Medical and health care: The medical and health fields have very strict water quality requirements. Reverse osmosis water filters can be used for water treatment in hospitals, laboratories, and other places to ensure a clean water environment.

Advantages compared to other water purification equipment

Reverse osmosis water filters have the following advantages compared to other water purification equipment:

1. Efficiently remove pollutants: Reverse osmosis water filters use reverse osmosis membranes for filtration, which can effectively remove bacteria, viruses, heavy metals, pesticides, organic matter, and other pollutants in the water, and have obvious water purification effects.

2. Retain minerals in the water: Compared with traditional water treatment methods, reverse osmosis water filters can effectively remove harmful substances while retaining minerals in the water, such as calcium, magnesium, and other trace elements that are beneficial to the human body, making the water healthier.

3. Efficiently purify water quality: Reverse osmosis water filters can make water more clear and transparent, and taste more refreshing. It can easily release fragrance when brewing tea and coffee, and can better reflect the taste of raw materials when cooking food.

4. Wide range of applications: Reverse osmosis water filters are suitable for a variety of purposes, including household drinking water, industrial water, commercial facilities, medical and health places, etc., to meet the water quality requirements of different places.

5. Long-term cost savings: Although the initial investment of reverse osmosis water filters is relatively high, in the long run, its high reliability, long filter life, and easy maintenance will bring more cost savings.

To sum up, reverse osmosis water filters have obvious advantages over other water purification equipment in terms of water purification effect and retention of beneficial minerals, and are favored and chosen by more and more users.

What are the frequently asked questions?

Can we filter seawater?

First of all, the ITEHIL water filtration system can completely filter seawater. Mutil-Setp filtration can easily filter rainwater, spring water, lake water, pond water, river water, swimming pool water, sweat, urine, tap water, coffee, cola, etc...

Which water filter removes the most pollutants?

Among the various types of water filters, reverse osmosis water filters are by far the most thorough in removing contaminants. The reverse osmosis water filter achieves efficient filtration and purification of various pollutants in the water through the reverse osmosis membrane, including bacteria, viruses, heavy metals, chlorine, residual drugs, pesticide residues, lead, fluoride, and other harmful substances, which can be effectively removed In addition, reverse osmosis water filters can also remove suspended solids, colloidal substances, odors and other impurities in the water to ensure safe and healthy drinking water. Therefore, from the perspective of removing pollutants, the reverse osmosis water filter is the most thorough type of pollutant removal among all types of water purification equipment currently.

What is the best home water filter?

There are many factors to consider when choosing the most suitable water filter for home use, including water purification effect, filtration capacity, equipment quality, brand reputation, etc. Among the many home water filters, one product that is considered to be the standout is the portable reverse osmosis water filter.


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