Hi there
No machine will drain all the water out of the machine as when the sump empties the drain pump cannot push anymore water out and when the pump stops, the water that is in the drain hose will run back into the machine most newish machines have a non return valve fitted to the drainage system but these do not always work as they are prone to getting things like small fish bones and seeds stuck in them.
I really hope this helps you.
Nick
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