does this filter look right?

I wanted to create a second loop that shows 1 post and it has to be less than 10 days old.
so i read up on it and I put this in my functions.php:

function filter_where($where = '') {
$where .= " AND post_date > '" . date('Y-m-d', strtotime('-10 days')) . "'"; 

    return $where;
}

then in the loop I have this:

add_filter('posts_where', 'filter_where');
 $featured= new wp_query();

 $featured -> query('meta_key=featured&posts_per_page=1');
 remove_filter('posts_where', 'filter_where');
 while ($featured -> have_posts()): $featured->the_post();
   $wp_query-> in_the_loop = true;
					?> ....

is the line-
remove_filter(‘posts_where’, ‘filter_where’);
necessary?
it seems to work without it and the rest of my posts are showing normally using the default loop.

so what is that line for?

and do I need to reset the query?

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