This water bottle purifier adapter works with Nalgene®, CamelBack®, 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 the best water purifier 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