Over time, hard plastic water bottles occasionally develop unpleasant odors and/or tastes. This typically occurs when bottles are stored incorrectly or cleaned infrequently.
Most rigid water bottles are made out of either polyethylene plastic (which tends to be cloudy in appearance) or polycarbonate (which tends to be clear). Most hydration system bladders have polyethylene linings, which retain tastes and odors more easily than polycarbonate. But all plastic bottles can develop nasty tastes or odors if cared for incorrectly.
The best way to maintain any plastic water bottle or bladder bag is to rinse it out after each use and to let it air dry completely. Most odor and taste problems occur when bottles are stored in wet areas or kept sealed for long periods of time with liquid inside. Polyethylene bottles can also develop unpleasant tastes/odors when they're used to store a variety of acidic juices.
If your water bottle develops a funky taste or odor, try the following procedure:
When cleaning hydration bladders, rinse them thoroughly and let them completely air dry before using them again. Do not place in your dishwasher.
NOTE: Some tastes and odors can be removed from plastic water bottles simply by rinsing them with anti-bacterial mouthwash.
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