When I first heard of the concept of washing water, I was dumbfounded. The idea appears as controversially undoable, yet brilliantly genius!
Most of us "serious" tea drinkers are aware of water is the mother of tea. Without good water, even the 50's pu-erh would taste less than average. While there are many bottled water companies claim to be the purest or best spring water on earth, do we trust them enough to put our precious tea leaves on line? Especially when we are away from home without any idea what brand to trust, washing your water before brewing tea is the next to best solution although it takes some time and effort.
Obtain several spring waters by different makers and from different regions, mix them all in one large container, preferably clay or ceramic ware, let it rest for 6 hours, use only the top 3/4 without disturbing the bottom portion. Here you have "washed" clean water for your tea.
Minerals from each bottled water react to each other, also neutralize PH balance. In some cases, condensation of the residues is visible, noticeably cloudy and thick at the bottom 1/4.
Love your tea? You can love your tea even away from home!