Seeking help! Leaking Calcium Reactor

I have a custom - Reefmania Dual Chamber Calcium Reactor.

I tried a few different methods and it still leaking at the o-ring, on both chambers. New rings replaced, I tried silicone grease and it still leaking.

I cleaned out the groves really good, but there are CNC tool marks on the groves.

Thank you all,
 
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