reset activity filter cookie on page load

reset-cookie.php

function otc_reset_activity_filter() {

	if (  isset( $_COOKIE['bp-activity-filter'] ) ) {
		unset( $_COOKIE['bp-activity-filter'] );
		setcookie( 'bp-activity-filter', '', time() - 3600, '/' );
	}

}
add_action( 'bp_template_redirect', 'otc_reset_activity_filter' );