THe inventor reached me trying to "sell" his design.
I didn't approved it after seeing the solidworks similations.
If you push it down to slow, ti does nothing. if you push it too fast (and get super toned triceps most of the water comes around the "drum" and sprays up, right on your face.
Now, lifting it... OMG... You have the weight of clothes plus the weight of water.
If you simply put the clothe sin abucked and agitate wit with your hands, simulating an agitator it's more effective.