These dosing containers have been specifically designed for use in the balling method of supplementing a marine aquarium with Calcium, Magnesium and Alkalinity with the use of a dosing pump. They are however versatile enough to allow you to dose any liquid product from them in to your aquarium. These dosing containers give a professional look you don’t get from just using plastic bottles, they are the must have dosing accessory. Reef EASI Dose 3 Dosing Container 4.5L Features: No drip when you remove the pipe complete with the lid with suction from dosing pump . Perfect for people who are limited with space inside their cabinets. Professional look. Each vessel is easily cleaned and rinsed out. 3 x 1.5 litre containers.