BuddyPress.org

Hello,
I have added following filter on activity page
`backticks`
function filtering_activity_default( $qs ) {
$qs = ‘action= activity_update’;
//}

return $qs;
}
add_filter( ‘bp_ajax_querystring’, ‘filtering_activity_default’, 999 );
$qs = bp_ajax_querystring(‘activity’);
`backticks`

it works for the initials but after click on load more then it does not work .
How can i add filter to the activity with certain type like activity_update,new_blog_post

If anyone has any idea please share.
thanks in advance.