The max. is to be filtered amount of water 1 liter would be correct.

So the construction is apparently sprung "green table" in the so-called.
Von wegen 2.7 liters! Correct would be: the max. in one pass to be filtered amount of water is 1 liter.
The amount of container to be filled by the filter cartridge is integrated summarizes straight
times 1 liter! Once again add water to filter no longer passes this to the lower container. Now, when you pour out the filtered water and in the upper water tank is not yet filtered water, so runs this out with, since the cap is not tight. But perhaps the producers resolve the perhaps the successor model.