You don not need to specify the pool - the profile (the user in the case of the user/secret combination) settings on the cluster determine the home pool (for storing content) and access rights for operations on all other pools on the cluster.

Hi Graham,

thanks for the prompt answer.

Am I right in assuming then that a particular user can only deposit content in ONE pool. So (exagerated example) if I had 20 pools I would need to create at least twenty users

Sort of - a profile has a single pool that it can write content to (its home pool) but multiple profiles can write to a single pool (in other words have the same home pool). Alternatively, multiple "users" could use the same profile credentials to connect and thus all write to the same pool.