Looking at that picture one would expect the height to be more than the diameter as you posted.
This means your drum volume is 47L max for water at the level 10 mark.
If we add the plastic on top which is unused space then the volume goes up to 56L
Manual says 62L of water which is not true 
47L is small, i thought it would be bigger. How has your family reacted to this? I think the semi-automatic they had earlier would be bigger
That means your max load for this is half the drum.
Can you tell me what number water level is halfway?
