Gravity water filters are freestanding units that require no electricity or connection to a water supply. For this reason, they are an excellent method of water filtration in areas without running water or electricity. Gravity filter systems are used by many emergency relief organisations to provide clean water in areas where safe water is not readily available.
Gravity-fed water filters are usually comprised of two containers placed one on top of the other. These containers are usually stainless steel containers in order to avoid rusting, and allow easy cleaning. Water is poured into the upper container, where thanks to the “pulling force” of gravity, it passes through two or more filter cartridges, and ends up in the lower container. This container is fitted with a small tap, where you can access safe filtered water.
The filter cartridges contained by gravity water filters are a combination between ceramic filter media and activated carbon. An example of a gravity-fed water filter that uses both of these filter media is the Doulton SS Gravity Water Filter with Super Sterasyl Candles.
In terms of water filtration capabilities, these types of filters can filter an entire day’s worth of water, which makes them a superior alternative to water filter bottles. Gravity-fed water filters are capable of addressing many common contaminants found in outdoor water sources such as rivers, lakes, streams, rainwater, etc. For starters, a good system will remove disease-causing bacteria and parasites like typhoid, salmonella, dysentery, cholera, E-coli, cryptosporidium, giardia, etc. Then, gravity filters also target contaminants resulting from commercial farming activities. Herbicides, pesticides, and other man-made chemicals can also contaminate natural water sources, thus, there is a need for gravity filters to be able to filter out these substances as well.
Although designed for outdoor use, this type of water filtration system will perform extremely well even in a domestic setting. You can use it as a countertop water filter to filter out chlorine, fluoride, and other impurities from you tap water. Some gravity-fed water filters are designed to remove heavy metals as well. For example, the Propur™ Big Stainless Steel Gravity Filter System will also remove heavy metals.
Even though gravity water filters are not as portable as water bottles, some of these filters were created in a way that you can fit the upper container in the lower chamber in order to save more space. Thus, you can take them with you on hiking trips or when you’re going camping. Because they require no installation, no connection to a mains water supply and no electricity, they are probably the most user-friendly water filtration system. They are also low-maintenance – you only need to change the filter cartridges from time to time. Some filter cartridges will even last an entire year before you need to replace them.
Whenever you need to rely on natural water sources for your daily water needs, you can opt for a gravity water filter to provide you with safe drinking water.