Filters are always good. You have to rinse the filter to remove carbon dust from them, but after they're rinsed and soaked, just pop them into a regular Brita water bottle or sports bottle and they work great. Depending on the intensity of use, they last for several months. They won't crack, don't shed char dust after rinsing, and won't clog as they age. Obviously they are made for Brita Water and Sport Water bottles and they do well. .Enjoy!
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