Future<Reply> filterDelete(String eventHeader, String valueToFilter, {int timeoutSeconds: 10})

Specify the events which you want to revoke the filter. filter delete can be used when some filters are applied wrongly or when there is no use of the filter.

Example: filterDelete('Event-Name', 'HEARTBEAT')

Source

Future<Reply> filterDelete(String eventHeader, String valueToFilter,
        {int timeoutSeconds: 10}) =>
    _subscribeAndSendCommand('filter delete $eventHeader $valueToFilter',
        new Duration(seconds: timeoutSeconds));