But you should not be nervous and upset in most cases with blockages can be handled independently.
In order to understand what needs to be done first, you need to decide on the degree of blockage. If he happened unexpectedly and until recently, it was not like their urges in this case can be used, most likely, it will help. When the blockage was brewing for a long time, you may need to remove the siphon and clean the dirt accumulated there, you can also use the iron cable.