VNX5300 broken storage pool. - Start again.

Hi,

We haev a VNX5300 that has been elft to rot (but still switched on) several of the disks have failed but i think we could still use it for testing and educational purposes,

What I'm struggling with is removing the broken storage pool. I want to get rid of this and build a new smaller one with less disks (keeping some for spares)

I've removed LUNS from storage pool but it still wont let me delete it. Is there a better way to do this either through interface or commandline?