The video shows a close-up of a poolside where a person is preparing to test the water. The person is holding a plastic cup and a water bottle, and they are pouring water from the bottle into the cup. The water appears to be clear and clean. The person then takes a spoonful of a dark-colored powder and adds it to the water in the cup. They stir the mixture with the spoon, and the powder dissolves in the water, creating a darker solution. The person then pours the mixture into the pool, and the water in the pool changes color. The video ends with the person observing the water in the pool.