A water filter works by physically or chemically removing impurities from water, making it safe for consumption. This can be done through different methods such as using activated carbon, ion exchange, or reverse osmosis.
To make a simple water filter, you will need a container, gravel, sand, activated carbon, cotton or cloth, and a way to secure the materials in the container (e.g. a rubber band or tape).
No, it is important to use clean and fine sand and gravel for your water filter. These materials should be free of chemicals and large particles that may pass through the filter.
This depends on the usage and the quality of the water being filtered. It is recommended to replace the materials every 2-3 months or when you notice a decrease in the flow rate of the filtered water.
A simple water filter can remove some impurities from water, but it may not be enough to make it completely safe for drinking. It is important to also consider the source of the water and to properly disinfect it before consuming.