Denoise before or after color corrections?

I am using a CHV filter to denoise a HDV footage that was shooted with auto gain on. It works very well.
However, I want to get the blacks darker. Should I do the color correction before or after the denoise process?
Considering the fact that making the blacks darker will increase the "grainy" aspect of the video, what is the best way to do this?
Thanks.

I tested both, before and after the CHV denoise filter. It`s quite similar, but I tend to prefer after.
I`m not thinking about crushing the black to denoise the clip
The CHV filter worked very well, the grainy aspect is gone.
Now I need to get the dark areas of the image to be black. From what I understand, the blacks should be at 0 on the waveform monitor.
When I get make the blacks darker, to be at 0, the grainy aspect comes back a little bit. I guess is a physical thing and there is no miracle solution...
Any suggestion is welcomed...
Thanks.

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