your tap water that has been filtered and ozonated, with no guarantee of dechlorination (and at a much higher price).
Most all filtered and ozonated water is dechlorinated prior to bottling.
Activated carbon and/or sodium metabisulfide is used as a chlorine scavenger prior to RO.
For municipalities with chloramine the amount of activated carbon is heightened to more than 1 cu.ft. per 1 GPM.
Dechlorination is done prior to RO, if not membranes are ruined and are a costly investment if not used to their full potential.
Donít use ozone treated water unless you let it set out for few hours in a open bucket stirring it a few times. Itís ozone concentration can be very, very high. Also donít add anything to water till after itís set out and equalized, ozone will oxidize anything anything you dump in water.
Bottled water that is ozonated cannot be put to market unless ozone has been depleted.
In truth this is a 6 hour time period before 200-400ppm of ozone shows a return of zero.
State laws prevent distribution until a 48 hour time period has been achieved.
This also allows for microbial testing that only takes 24 hours.
Thus going to market is rendered safe!
This does not even touch on the fact of liquid nitrogen injection to "stiffen" the bottles.
In the USA there is not law regarding bottled water labels.
The logical answer is that most bottled water is simply filtered well or tap water.
There are laws, federal and state regulated.
Permits must be paid for to the state to be distributed too.
The more states one ships to the more fees are required.
This does not mean they are always followed.
When not followed fines may be imposed.
Filtered well and tap water yes, large scale RO does not come @ a cheap price.
Military contracts come with even higher demands regarding THM & bromate levels.
Don't ask why I know all of this!