Bathtube with selfrunning waterpump

There are a few people on YouTube who have figured out, how to build and use a special Siphon pump, that lets you pump water without electricity from a deeper position to a higher position without breaking the siphon inside the passive pump barrel...

This way they have build a selfrunning water shower bathtube..

The trick is to use a longer output pipe, so the water volume in the output pipe is always bigger than the water volume in the input pipe, so the total water volume is heavier in the output pipe and they have a special vertical waterpipe that traps airbubles, so the vaccuum in the output pipe is always preserved and can't be broken....so the outflowing water out of the barrel always produces enough suction to pump in water from the lower position bathtube...