Headphones

Hello where can I buy the replecmemt filters for the moondrop chu? I have had these since June of this year, and one side was getting blocked by the filter so I couldn't hear much out of it. I have heard this is a common problem with these? Right now I am running them without the filters, but it's almost to loud now. Do you guys know where to buy them? Preferably somewhere online with fast shipping? Or if you have any other suggestions please feel free to let me know. I'm also thinking about picking up the second generation of these the moondrop chu 2 with the replacable cable. have any of you guys tested them out?? And do they have the same issue as the original? Please let me know!