Hayward Filter Bank

Welcome to TFP!!!

I am unclear what exactly you are asking.

Are you asking if you can use a c900 instead of a c800? Or are you asking if you can mix and match parts?
 
Still unclear ... maybe I am dense :hammer:

Are you just looking to replace the lower part of the filter body? If so, from what I see online, the parts are not interchangeable as the filters are designed differently.

You could certainly use a complete c900 inplace of the c800 with maybe some minor plumbing changes.
 
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