There are 2 ways of getting rid of the waste water and sewage water. The most common way of releasing the water is to plug the sewage/waste water hose to the side of the campervan (staff at campervan depot will show where the hose goes into) and the other end of the hose goes into the drain, a designated hole in the ground. The second way of releasing it is to take the tank/cassette out of a drawer outside the campervan and dump this tank/cassette above the dump station hole, open a bar and all the waste water and sewage can run through the drain. To fill the tanks with fresh water you need a fresh water hose which is provided in each campervan. Plug the hose to the water tap next to the dump station and connect the hose to the right connection point at the campervan. Then turn the water on. It might take a few minutes to fill it up, you will hear and see when it's full as water will be dropping aside or at the back of the campervan. Then turn off the water, close all drawers and store the hose. In both cases you should clean the hose or the tank/cassette with clean fresh water and add toilet chemicals afterwards by either putting them into this tank or just into the toilet and flush it down. That keeps the toilet clean and fresh smelling. For more information, please click the link below. http://www.new-zealand-campervan-holidays.com/motorhome-camping.html For a downloadable leaflet, please click the link below. http://www.new-zealand-campervan-holidays.com/support-files/finding_a_dump_station.pdf