Yes it is possible. But there are a few things to consider. After sending the deletion via the web service, all entries / keys in the pool are deleted instantly.
The Movilizer cloud will remove the pool with the help of a cleaning officer who runs approximately every 4 days when resources are available. And it will just delete the pool if it is empty for 90 days. This means that even the pool is empty, it can still be visible on the Portal until the cleaning worker completely removes it, when it remains empty for 90 days. 90 days is the current setting for the worker ... it may change sooner or later, but at the moment this value.
<masterdataPoolUpdate pool="yourPool">
<delete />
</masterdataPoolUpdate>
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