Portal:Water/Did you know/7
Appearance
< Portal:Water | Did you know
![DYK Question Mark](http://upload.wikimedia.org/wikipedia/commons/thumb/4/44/Nuvola_apps_filetypes.svg/55px-Nuvola_apps_filetypes.svg.png)
- ...that total dissolved solids, a class of water pollutants, is useful as an indicator of aquatic biota health, yet harmful to the plumbing of aquaria and hot tubs?
- ...that a Navy shower is a method of showering that conserves both water and energy?