Then why is the water yellow?
I noticed that when I filled the bath tub to rinse some stuff of salt water, that the water in the tub had a yellow hue to it. Not enough that you would notice in a glass of water... but when the tub was full, it was easy to see a yellow hue.
And just because the water is triple RO filtered doesn't say anything about the cleanlyness of the tanks used to store it and the pipes used to run it. Especially over time, it's possible for "stuff" to grow in there (did you see the news report a few years back about tests done on the water storage tanks of airplanes?).
Now I am in no way saying the water on
DCL is bad in any way. I feel perfectly safe (as a healthy adult) drinking their tap water. But when we brought an infant on board with us, I did decide to be extra causious and brink my (back-country hiking) water filter with be to give the water one last filtering before using it to mix with powdered formula.
BTW, because of the possibility of "stuff" growing in the tanks and plumbing, it would make perfect sense if DCL does indeed add chlorine (just like most public water works systems do) to the water to insure the safety of their water.