Keep your hydration reservoir and water bottles clean with the chlorine-free Osprey Hydraulics Reservoir Cleaning Tablets. Fill your reservoir half full or your water bottle completely full with warm water, drop 1 tablet in and screw on cap; let stand for 5 min. to dissolve and then shake to mix. For reservoirs, squeeze bite valve and depress reservoir to remove air and fill the tube with the treated water. Let your reservoir or bottle stand for 15 min. and then drain and rinse with clean water. Osprey Hydraulics Reservoir Cleaning Tablets are nontoxic, chlorine free and biodegradable. Package includes 10 tablets.