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Single use water bottles are intended to be used once and then disposed of. Consumers who choose to use them over and over are using them for purposes other than intended by the manufacturers. Any time a consumer product is used in a manner other than that for which it was intended, risk is involved.
Disposable water bottles are made from polyethylene terephthalate (PET), which breaks down over time. It is safe for use as a disposable bottle, but is not designed to stand up to repeated usage. When reused, PET breaks down and releases toxic compounds that can contaminate water and other liquids.
Representatives of the Canadian Bottled Water Association (CBWA) assert that should not reuse disposable water bottles even once. Because consumers have no way to properly sterilize plastic water bottles, the CBWA advises that reusing plastic water bottles is not recommended at all.