Reverse Osmosis Process

  1. How It Works

    • Reverse osmosis is a water filtration system used by many people worldwide. This water filtration system was originally created in to provide desalination of seawater, but it is now commonly used in many homes to remove strange tastes or common chemicals from drinking and washing water. Reverse osmosis systems use pressure to force water through a system of three filters. Due to the contaminants remaining in the filters, cleaning and maintenance are required, to keep the filters in operating condition.

    Initial Filters

    • The treatment device should include an initial filter that eliminates lime and rust. The device uses pressure to force water into one side of the system, where there is a membrane dividing the two sides of the reverse osmosis device. The membrane is most commonly made of cellulose acetate or a polyamide resin. Contaminated water flows through the membrane, which filters out larger chemicals and chlorine. The holes in the membrane are so small that only water molecules are small enough to pass through. The membrane traps all impurities and only purified water to pass through to the other side.

    Final Filter

    • After completing the initial reverse osmosis process, the water goes into a storage tank located near the osmosis system. This tank is connected to the water faucet through which the purified water is dispensed. As the water is drawn up through the faucet, it passes through the last filter, which is located in the storage tank. This final stage allows the water to be cleared of any remaining odors or tastes by filtering it through an activated carbon post-filter as the water is dispensed.


    • For the reverse osmosis process to function correctly, the system requires regular maintenance and replacement of filters. The frequency with which the filters need replacing depends on how much usage the system is receiving. Depending on the system and its size, the frequency of maintenance and filter changes vary from one to three years. While reverse osmosis has great success in small applications, such as purifying the drinking and washing water for a household, it is not practical for use on a larger scale.

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