Haven't had to do many water changes, but there is a drain in the sump so water can simply be added to the tank for semi-automated changes, and there is also a pipe next to the tank that I can siphon into for removing waste from the tank. The red barrel is just filled with tap water to give it a chance to warm up, the room is heated to 22C and the tap water is only about 8C at this time of year. It is filtered by a large sump, all the details are in the thread if you look back thru it.













