Hello Lily,I purchased the monoblock in December 2021. It has been in use since then. I have only ever used Corsair XL8 coolant and have twice flushed the loop with distilled water.
Edit: For the life of me I cannot figure out how to reply to a comment in a prior thread, only thing I can see is to "Ask a New Question" or provide new answer. Apologies for the duplication.