Venturi pump / pool vacuum cleaner

This is a pump that works with the venturi effect. All you need is a garden hose with water pressure and a rubber o-ring. It fits a normal 13mm garden hose and a Gardena quick connector. If you attach a washcloth or something else that can filter to the side of the hose, you can also use it as a pool vacuum cleaner. Use a tie wrap or hose clamp.