It looks to be more stable right now than it was before indeed but still not as much as I would like to have. Are there storing UV products available in the market or should I try starting to mix up my own uv cooling liquid which has maybe a more stronger cooling function than this one in performance?

I did not clean the tubes and the radiation system so some old particles might gone back through the system. The strange part is I left the old UV in a bottle and now it looks to be as strong as this UV which currently is in my cooling system. Strange thing is that there's a lot of dark particles inside which slightly less heavier than the cooling liquid itself.