chlorinated
The bacteria was isolated more frequently from unchlorinated water than from chlorinated supplies.
Apparently, a failure at the treatment works led to unchlorinated water entering the system.
The unchlorinated community water supply was also implicated as the most likely source of the infection.
There is something special about being able to swim in deep, unchlorinated water.

SMART Vocabulary: related words and phrases

Physical & chemical processes
absorbable
absorptive
absorptive capacity
absorptivity
acidification
endothermic reaction
excitability
excitation
excite
exergonic
exothermic
exothermic reaction
impregnate
re-emit
reabsorb
react
reboil
recondense
scald
vaporize