This is a theory that needs to be checked to see if this really makes sense…
The idea is to take a pile of small plastic balls and put them in the tab. Note that it is a good idea to make sure that they cannot fall into the drainage pipe as this may cause a real problem. They should be heavy enough to sink.
Then the tab can be filled with hot water as normal.
Due to the fact that the tab is partially filled with plastic balls less water are needed to fill it up so here comes the first advantage of this idea-saving water!
The second advantage will be felt (hopefully) after the person enters the tab. As one buries himself or herself into the plastic ball filled tab with hot water it should be a pleasing massaging sensation as one moves in the tab.
There is the issue of washing the plastic balls from the soap etc. and drying them properly after use or it will get nasty after a few days.
The balls may be totally separate or linked together in some way for easier handling.
