After water has been purified will it always be purified?

or:After water has been purified will it always be purified?or:Maybe, maybe not. If it is exposed to air it can collect dust and microbes. If it is w

or:After water has been purified will it always be purified?

or:Maybe, maybe not. If it is exposed to air it can collect dust and microbes. If it is well sealed then it will stay pure until the seal is broken.

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