Quickest and Easiest to use.
Just place straw into filter and drink. Can't be much easier then that. In our class the instructor recommends this filter highly. The draw backs is you need to keep it in the shipping package because the straw is not packaged with the unit so if you open the pack you have two pieces that can be seperated from each other. They should of been shrink wrapped together or something to keep it hygentic and together till you need it.
Reviewed by: Richard from Baltimore.