After using the Aquamira bottle with filter you should gently remove the filter from the cap, blow and shake the filter free of any internal or excess water and allow it to dry.  If necessary, the bottle and cap can be hand washed with detergent or placed on the top shelf of the dishwasher.  Reassemble the filter to the cap by holding onto the bite valve on the cap and gently twisting the filter into the valve.  Allowing the filter to dry is a good practice, but, be assured that bacteria will not reproduce in a wet filter because it is impregnated with silver (Miraguard) to prevent growth.