Frequently the problem lies in the ink used, since some types dry very slowly and tend to smearing; a switch to another ink, e.g. Montblanc or Jansen, can here provide significant remedy. Alongside, dried ink residues are a typical cause that glue up the feed and produce an irregular flow. A thorough flushing of the fountain pen with distilled water helps in many cases. On newer Pelikan models, the nib together with feed can be unscrewed and soaked overnight in a water glass, by which stubborn deposits are loosened.