I scrolled a few comments deep and didn’t see any mention of the fact that you may be filling it with tap water which has a trace amount of chlorine in it. Water in your municipal water system not only has to treat the water from the source, but it also has to keep it treated until it reaches its destination through all the pipes it travels. Refilling your bottle introduces clean chlorinated water to your bottle and helps to keep the growth of algae and mildew at bay.
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