Features a replaceable carbon block filter for fresh, clean water; replacement filters are sold separately and should be replaced every 6 months for best performance. Enjoy cleaner filtered water that tastes better than bottled water and helps reduce plastic waste with every refill. Specifically designed to fit large 30 to 50 oz tumblers, including popular styles like Stanley cups, so you can enjoy filtered water without giving up your favorite oversized cup. Each filter lasts for up to 250 uses of full cups, delivering clean fresh water straight from your tumbler. Just replace the filter about every 6 months. Built for lasting performance and everyday convenience. The straw is easy to clean, making everyday use simple, efficient, and hygienic. Refill your large water bottle throughout the day without worrying about the integrity of the water you drink. The Mist tumbler straw, compatible with popular Stanley cups and other large tumblers, features advanced filtering technology that instantly removes chlorine, bad taste, and odor from your drinking water. Designed as a perfect replacement straw for your favorite tumblers, it’s easy to use, hygienic, and unbeatably effective in purifying tap water. Try this reusable drinking straws as a sustainable and refreshing way to enjoy every sip to the maximum!