More important is: the source of water used. Make sure it's not tap water, and that it's distilled water to reduce contaminants and improve safety. Also, rinse your unit well with soap and water with a final rinse with distilled water before drying daily. You want to keep your unit as clean as possible.
Answered 10/16/2014
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4 doctors weighed in across 2 answers
A doctor has provided 1 answer
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