PM replied
On the large label/nameplate it should say a CCP then three digits for the filter size
I know just by looking at it, that It's either a 420 or a 520.
Can't tell for certain because the angle of the pictures is weird.
For reference brand new I charge about $800 to put in a Clean and Clear 420.
However this looks like it is going to need gone through. It also will need new bulkhead unions due to the way the pipes were cut, and I'll never be able to sell a used filter for more than probably $200.
The pump on the other hand really I want just for spare parts.