Interesting. Thanks for posting. What are they going to do about the huge bathroom whirlpool/spa tubs people have? Surely those use much more water and energy than a nice shower head with decent water pressure. When we stay at hotels that have those low-pressure showerheads, I have no doubt that it takes me three times as long to rinse my hair. I doubt they are saving any water.
It saves us water. We are on a well and septic system. We take Navy showers, except in the dead of winter. Good pressure from one of those variable mode shower heads. The tub is heated to 108F 2x a day in winter and once a day in summer. Takes about 1 1/2-2 hours each time and saves money over leaving on all the time, which usually means it runs one hour out of every 4 plus it will run the heater every few hours for awhile to keep the temp up. Only I use it in summer. We add water about once a week or so, whenever it gets a gallon or so down by evaporation. It gets drained, cleaned, filter changed and refilled about once every 3 months or so and stays clear and sparkling in between. We use a polymer clarifier and an oxygen shock. Chemicals run about $60/year. We also clean and reuse the filters and probably buy one at $45/each, every year. I think I have 3 that are still efficient on hand at the moment.
When replacement time comes, if I can't find another small tub for a decent price (they run about $4k), we have decided we can likely replace the works for under $2k in today's prices. The acrylic tub and the insulating foam are still in good shape. I think they are good for 40 years or so.
I have looked at the drain and fill tubs with an in-line heater and I think they use way more water and energy than ours.
Don't worry, the good comrades will cut your hair off. Problem solved.