that could have been me sorry. only when we are on the last dump before home though. And I never empty whilst others are around not very sociableI don't rinse the cassette unless there's a blockage, no point as it's only going to be used again. Annoying to get stuck behind some plonker at the emptying point who insists on rinsing it three times, shaking vigorously between ( guaranteed to dislodge the level float) and holds everyone up for no reason.