To sanitize your flask properly before use we recommend following the steps in our Flask Care Guide. For the screw top, you can allow it to soak in hot soapy water for several minutes. After sanitizing your flask, fill it up with clean water and allow it to sit a few minutes. After allowing it to sit, pour out the contents in a clear glass to see if any particles are in the water. If there are still particles remaining after cleaning your flask, please repeat the sanitizing steps 1-2 more times.
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