Identify the impurities in the water you intend to purify. Visible impurities such as mud and algae are the easiest to identify. Other possible pollutants include bacteria, small fungi and dissolved chemicals.
Clean the 3-foot-tall cylindrical tank thoroughly with clean hot water, then drill a hole at its bottom. A water tank that you are not currently using can substitute for the cylindrical tank. Use the pipe connectors and wrench to connect one end of a pipe to the hole and the other end to the tap. Fix the selective membrane at the opening at the bottom of the cylinder to the pipe using a strong non-toxic adhesive. This membrane removes microscopic impurities and ions from the water through reverse osmosis. It is fixed since it is at the bottom of the cylinder. This is the final step of the purifying process.
Make small, evenly distributed holes on two trays, similar in diameter to the tank, using the drill. Fix the carbon filter onto one of them. Use trays made of stainless metal such as steel that does not rust. Buy them from hardware stores or recycle some that you have at home. Measure a length of 1 foot from the bottom of the cylinder, then affix the tray on which you mounted the filter at this position using the adhesive. This tray filters out organic chemicals and odor from the water.
Mount the fiber filter onto the second tray using the adhesive, then mount the entire assembly 1 foot above the first tray, again using the strong non-toxic adhesive. This tray filters out sediments and other suspended particles in the water, including mud and algae.
Close the top of the cylinder air tight and drill a hole through the top. Connect a pipe at this position and connect this pipe to the contaminated water source. The impure water passes through the system and is tapped from the bottom to a storage tank. The water in the storage tank is clean and suitable for use. But boil it before you drink it.