"grinding, which" vs "grinding that"

[xuliang]

I was saying our production processes help low-carbon footprint. Here is one part of it :
A. "For the machining of our parts, after numerous tests in half a year, grinding, which produces lots of powder pollutions, has been replaced by a new milling process .
B. "For the machining of our parts, after numerous tests in half a year, grinding that produces lots of powder pollutions, has been replaced by a new milling process .


I want to mean: after lots of tests, the milling process is developed and have replaced grinding. For the bold part I first used A, the non-restrictive attribute clase. I am wondering if B is better?


Could you please help? Thank you.

 

[Glasguensis]

Both are fine.

 

[Florentia52]

Either will work, although the meanings are slightly different, and you would need to delete the comma after "pollutions" in the second version.