Differences in GSS-Mini-A and GSS-Mini-7

I am interested in your GSS-Mini-7 water filters for travel.
2 questions:1. What's the difference between the Gss-mini-7 and gss-mini-A?
2. Do i simply pour water into the container and then re-pour the filtered water out to drink?

 To use the filter you simply pour water into the upper chamber and then the filtered water drips into the lower chamber. It's a surgical-grade stainless steel container which you can drink from or pour into another container to consume from.
 I have provided the following link which shows a table that provides the most clarity as to the difference of the two models. Please review:  http://doultonusa.com/doulton_water_filters/Emergency-gravity-filter.php.