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Originally Posted by Cathar
A bit hit and miss really. Mine had a loud ticking noise issue which was about as loud as a ~35dBA fan comparitively speaking. This issue almost resolved itself when I pulled the pump apart, and re-assembled. The noise was less after inspection, cleaning and re-assembly. I then left the pump running circulating water for a week and the noise almost totally disappeared, and by that I mean that I had to have my ear within 12" of the pump to hear it, but it still hummed quite noticably which was audible from further away, and so I would say that the pump had quietened down to ~22-24dBA-ish.
Still, it was not as quiet as a "low hum" like some people have described, again, due to issues arising from that ticking noise which may have caused other damage resulting in the noisier than usual operation.
Plenty of people have gotten their pumps and have been totally happy and reporting nothing more than a very quiet hum and then only when sitting against something. Conversely others have gotten their pumps and reported the same loud ticking/clicking noises. Strange though that I got my pump for review purposes, and so did Roscal, and both had these issues. I never completed a review because I had contacted Dave @ C-Systems and he said the pump had likely been damaged in transit and that he'd send a replacement pump, but a replacement never arrived. I even offered to send this pump back if it would help. :shrug:
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Thanks for the response Cathar, hopefully mine will be alright. If it makes funny noises, I'll probably take it apart and see what makes it tick (no pun intended, really
).