Right now there are 49 deals from Amazon Resale, formerly Amazon Warehouse Deals, in Sports & Outdoors › Outdoor Recreation › Camping & Hiking › Hydration & Filtration › Water Filters. These are inspected returns and open-box items that Amazon sells and ships itself. WarehouseHunter puts each one next to its current new price, so you can see what you save at a glance.

Brands with the most offers here: LifeStraw, Platypus, Cross, HydraPak, Katadyn, Amazon Basics, Amyhill, Camco. Every item is a one-off, so the stock moves all day and new deals keep arriving.