Pocket Casts features a number of storage tools to help manage your episodes. You can access the following options by tapping Settings, then Storage:
Store podcasts on
Allows you to choose to store episodes on either your device or on an SD card. By default it is set to Phone (/storage/emulated/0/Android/data/au.com.shiftyjelly.pocketcasts/files/PocketCasts)
Custom folder location
Allows you to specify the exact directory to store episodes on. Use this if your SD card does not appear in the Store podcasts on dropdown list.
Automatically deletes older episodes, so that each podcast displays only the most recent 1, 2, 3, 5 or 10 episodes, depending on your configuration. By default this setting is off.
Auto delete played files
Automatically deletes episode files when they are marked as played. By default this setting is on.