How to delete all forum members?

Hi, i want to delete my forum members, but from ACP -> Users and groups -> Inactive users or handle users is deleting me to few members - 50.
 I have to delete 1600 members so 50 once is a little bit to low..

 Any ideas how can i delete all of them? Thanks in advice. 

Hi, actually you are right and unfortunately there's no way that delete 50 members at a time. You can make a suggestion in this regard. Nice day.

Hello Row, thank's for the +1, but i said that i wish to delete more than 50 members.
 So, you can delete 50 members at a time. 

Hi, it is impossible to delete more than 50 members. You must delete 50 members one by one. Sorry. Good evening.

Uhm, okay..

 The topic can be locked now.