How does the refrigerator water filter work?

How does the refrigerator water filter work?

A few days ago, I was talking to a client about a refrigerator water filter, and he asked me, "how does a refrigerator water filter work?" I spend so much time doing it that sometimes I forget that not everyone has the same background and experience as me, and the refrigerator water filter is really fun!

Activated carbon - the hero of filter

There are more than one way to filter water, but the most popular one in home application is activated carbon filter. These filters are characterized by tiny carbon or charcoal particles - although very small, they are usually porous and have large surface areas, usually from organic sources such as coconut shells. For example, a gram of activated carbon has a surface area of more than 500 square meters, which means that a very small amount of carbon can filter large amounts of water.

Adsorption – how carbon cleans water

Highly porous materials are important because carbon filters water through a process called adsorption. Basically, what happens is that water flows through the carbon particles and through the carbon particles, and the impurities and particles in the water are absorbed by the carbon, and the water passes through the clean surface.

What about the velocity?

Another consideration for the filter is the flow rate. Higher flow rates make water flow faster, which means that water takes less time in the filter and may pass through some minerals, chemicals or other impurities. Lower flow rates mean that water takes more time on the filter and is cleaner. Of course, this means that the filter may wear faster and need to be replaced as soon as possible.

How often should I change the filter?

The impurities absorbed by the filter remain on the surface of the carbon, which is why the filter is no longer effective over time. You'll notice that the taste and smell of the water coming out of the filter has changed, which means it's time for a new one. Most filters have a rated capacity of about 300 gal, typically about 6 months. If you use a lot of water, or have hard water or well water, you will need to change the filter more frequently.