431174 | Corning® 1000 mL Bottle Top Vacuum Filter, 0.22 µm Pore 54.5cm² PES Membrane, Fits 45 mm Diameter Necks, Sterile, 12/Case | Corning
Bottle cap filter removes impurities from drinking water
Amazon.com: CAP FILTER Water Filtering Cap for Portable Survival & Camping Gear, Water Purifier Compatible with Water Bottle (Bottle Cap Replacement), Supply for Hiking Camping Travel Fishing (for Mineral Water) : Sports
Nalgene DS0320-2545 Reusable Bottle Top Filter Holders-Polysulfone_250ml-45mm - F2767-2 - General Laboratory Supply