Enema pump is simple tool to clean your anus before anal penetration. Easier to fill it with water than douche. Fill it to the top and insert the tip in your ass. Pump approximately 100ml (3.4oz) in your ass. You can use 3 times before you have to fill the bottle with water again. With douche you would need to fill every time. More convenient and quicker.
Do not use hot water above 45 ℃ to wash bottle, otherwise the bottle will deform as it is simple plastic.