The RapidPure Universal Purifier Bottle Adapter turns your favorite wide mouth water bottle into an advanced water filter and purifier to provide you with safe, great-tasting water. This water bottle purifier adapter works with Nalgene, CamelBak, Hydro Flask, and Klean Kanteen wide mouth bottles and features RapidPure's innovative technology. Unlike microfilters that rely on pore size to simply filter out bacteria and sediment, RapidPure water treatment actually purifies water using electroadsorption, removing bacteria, parasites, viruses, parasites, chemicals, heavy metals, pesticides, and microplastics, as well as filtering out sediment. With no pumping, priming, or squeezing required, this fast water filter is one of the best water purifiers for personal use. RapidPure continues to work even after it has been frozen, giving you peace of mind if the temperature suddenly drops. With RapidPure water purifiers, quenching your thirst is safer, faster, easier, and better tasting.