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Clean Water, Clean Earth: How Gravity Water Filters Cut Energy Use
Monday, November 9, 2020

Every outdoor person has been there. You're hiking or camping and wonder what would happen if you got stuck and ran out of water. Maybe there's a stream nearby, but is the water safe to drink? One thing that might help is a gravity water filter.

From cleaning water for personal use to wastewater treatment plants, gravity filters find a wide variety of use in making water safe to use. Keep reading to learn more about how they work and how they can even save energy.

What Is a Gravity Water Filter?

A gravity water filter is exactly what it sounds like. It's a method of filtering water that uses gravity to work. These filters are generally made of two areas of water separated by a semi-permeable membrane.

This membrane only allows particles of a certain size to pass through. This means that solid materials like contaminants are not allowed to pass while the liquid water molecules are. The result is highly filtered water on the other side of the membrane.

Because this type of filter uses gravity, however, the holes in the membrane can't be too small. If the holes are too small, the surface tension in the water will not allow it to pass through the membrane.

This means some small material may get through the filter as well. This is why some filtering techniques use higher pressure to force water through a smaller membrane. Although gravity filters use atmospheric pressure, it is still sometimes not enough.

Filters that force water through a membrane can use large amounts of energy to clean the water. Some

How Do They Save Energy?

Many wastewater treatment processes use methods of filtration that require large amounts of energy. Physical processes typically force water through a filter or use skimmers to remove large contaminants.

Some wastewater systems use things like a centrifuge to separate solid material from the liquid water. Other methods might involve biological or chemical means of cleaning water, but these can be expensive and might not work for all situations.

A method of filtration that can save up to 40% of energy is a gravity water filter. Instead of having large parts moving the water around quickly, these just let gravity do its work.

One method of saving energy involves changing the density of wastewater to make sure it moves slowly through a filter. This will eliminate the need to use energy to push the water through the filter.

In addition to saving energy with a gravity water filter, wireless technology can be used to monitor the quality of water at different points in the filtration process. This removes the need for physical wiring and piping within the system.

Next Steps

Now that you know how gravity water filters work and how they can save energy, feel free to contact us for help choosing the right filtration system for you. If you enjoyed this article, please check out some of our other recent posts!