Now I know these pumps are not made by EKWB (EK Water Blocks) themselves but they have a responsibility toaddress any issues that may develop over time (at least within 2 years under EU law) should there be a manufacturingproblem - and let me tell you right off the bat that if you have a problem, they will flat out deny that there'sanything wrong and it's all within "their" standards and will refuse to do anything about it. Don't be fooledby their reassuring fluffy customer support mission statement that is intended to give you false sense of security.I've had this unit for just about 1.5 years and during that time I've heard all sorts of noises comingout of it, one being an insanely loud grinding noise, to just plain loud at anything over 3000RPM - if it sat orwas connected to the PC case - now in my ignorance of anything actually being wrong I was able to mitigatethese problems by resting the unit on soft packaging foam and limiting it's Max speed to just under 2800RPMProblem solved! Or so I thought, 1.5 years in and the thing wouldn't start causing my graphics card toover heat and force me to do a hard shut down. This is when I realised the pump wasn't working and wouldn'tstart.Got in touch with EKWB customer support to RMA the thing, as it's still under warranty under EU law (2 years)And they said that all I needed to do was open up the pump and clean it. Which I did, and I found tons of this blackplastic residue coating the internal structure of the impeller and bearing seat where it's rubbing, and sure enoughit worked again, all good so far - but then I noticed that the impeller part of the unit wasn't really looking verygood eg. what I have shown in the photos as internal plastic chipping. wearing of the seat where the bearing makescontact, horrible moulding, external edge chipping, a dent in the outer shell and rust!I couldn't believe my eyes and thought there's got to be something wrong here, and there is - it's called balancing,these impellers have to be carefully balanced to take out any wobble it might have at high speed and if it's even slightlyout your going to get vibrations which lead to wear and noise, ultimately after further use the thing will destroy itself!Easy fix you might say, just swap out the impeller for a new one? Nope! EKWB (EK Water Blocks) say "Impellers are not available as separate spare parts, and we do not replace them individually." and "There is no functional fault that would qualify this pump for an RMA. This concludes our position on the matter" LOL - It's like the dumbest response to a simple fix I've ever got from anyone - all they had to do was contact their suppliers - Xylem - in this case and send out a replacement part - no need for RMA.Anyway, if you've read this far, my word of caution is, if you have any symptoms like loud crunching noises or unbearablevibration above 2800 RPM you may well have a dodgy impeller, open the unit and visually inspect the impeller, if it doesn't look right send the unit back immediately! - personally I wouldn't buy from EKWB (EK Water Blocks) as they are just completely useless as a company, have no quality control standards at all, and they will leave you high and dry on your own.Good luck!
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