Note that SQLAlchemy's built-in pooling is only one style of pooling,
known as *application level pooling*. An architecture can also use
- *pool middleware*,
that is, a server that runs separately and mediates
+ *pool middleware*, , a server that runs separately and mediates
connectivity between one or more applications and a database backend.
The `PgBouncer <http://wiki.postgresql.org/wiki/PgBouncer>`_ product
is one such middleware service designed for usage with Postgresql.