を通(つう)じてThrough, Via, Throughout

を通(つう)じて and を通(とお)して are two grammar patterns in Japanese that have very similar meanings to each other, and are used in many overlapping situations. Primarily, they can be thought of as meaning 'through (A), (B)', or 'via (A), (B)'. This 'through' may either indicate a method, or a location.

通(つう)じる 'to flow', or 'to go through' and 通(とお)す 'to make a path', only differ in that the former is intransitive, while the latter is transitive. Because of this, 通(つう)じる will be seen more often in regard to information or communication where (A) is the connection through which (B) occurs. 通(とお)す on the other hand more often refers to direct locations through which something is transferred or relocated. As this expression begins with を, it will appear after nouns, before expressing in the (B) part of the sentence exactly what was done 'through' (A).

Caution

The primary difference between を通(つう)じて and を通(とお)して lies in the intransitive and transitive nature of the verbs themselves. Due to this, things that are being done 'intentionally', or 'by use of (A)' will tend to use を通(とお)して. を通(つう)じて is more common when something is being done 'throughout (A)'.