Water is essential for life and it is available worldwide but there are several processes that we need to carry out in order to obtain clean water. There are many dangers associated with drinking unfiltered water such as various illnesses. The traditional way of treating water is boiling but there are certain chemicals that cannot be removed in this way. There are different filter media that is used to remove different contaminants. These can be activated carbon, UV filters, reverse osmosis filters, sand and gravel etc.
Gravel is basically fragments of rock that come from a variety of sources. They can come from the ocean beds, rivers and lakes. You can read up more about gravel as a filter media on the Riversands official website. There are many sediments and contaminants that can be removed by using gravel. But you need to consider the size and hardness of gravel along with its angularity when using it for filtration. While gravel is a broad category, there are a few factors that will help you narrow down what kind of gravel is required for the filter. You need to select more round gravel. Angular gravel will not be able to provide maximum efficiency for filtration. There are even filters that combine sand, gravel and charcoal to create an efficient water filtration system. Sand and gravel systems offer an affordable and easy technology for many developing countries to purify water.
While gravel can make a difference when it comes to purifying water
There are other filter media that has more effective filtration. When water pushes off the rocks, it can introduce more oxygen into the water. And having more dissolved oxygen causes iron in water to precipitate. This way, you will be able to filter out iron along with the off taste and discolouration that it imparts to the water. You can find gravel in slow sand filters as well. They are usually located at the bottom later so that it creates a channel for filtered water to reach the outlet. This way, sand will not clog the outlet pipe. Only insoluble particles will be removed from the water when you use a gravel filtration method so this is not considered exactly safe due to bacteria, viruses, pesticides and other chemicals that can still be present in the water.
You can even create a DIY gravel filtration system.
This is a great option for survival situations as you will be able to find gravel nearby easily. There are also more complicated ways of using gravel to filter out water.You need to have water flowing from the top, through the filter and out from the bottom when creating a gravel filter. To make a somewhat effective water filter, you can use fine sand, coarse sand, charcoal powder and gravel. You can use a clean cloth, a coffee filter or cotton balls to filter the water. The layers of filter media can be placed inside a plastic water bottle. The filter media has to be washed thoroughly with water before you use them.