You can disassociate all entities associated with a storage policy and remove the policy completely.

Prerequisites
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Verify that you are connected to a vCenter Server system.

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Verify that you have Profile-driven storage update privileges.

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Verify that a storage policy named pol-tag exists in the vCenter Server environment.

Procedure
1

Get the pol-tag storage policy and store it in the $policy variable. 

$policy = Get-SpbmStoragePolicy -Name 'pol-tag'
2

Disassociate all entities associated with the $policy storage policy. 

Set-SpbmEntityConfiguration (Get-SpbmEntityConfiguration -StoragePolicy $policy) -StoragePolicy $null
3

Remove the $policy storage policy. 

Remove-SpbmStoragePolicy -StoragePolicy $policy