How to remove water in diesel?

To remove water from diesel, start by using a water separator or fuel filter designed to trap water. If the contamination is significant, you can use a fuel polishing system that circulates the diesel through filters to remove both water and impurities. Another method is to let the diesel settle in a container, allowing the water to separate at the bottom, which can then be drained off. Always ensure proper disposal of any removed water and contaminants.