Forum » Koralia Nano 900 got horrible loud.

Hi, i own two Koralia Nano 900. Both have been dead silent all along. I have them since 2 years or something and there was no noise except for a very quit muted humming. A few days ago both of them - almost at the same time - started to become annoying loud. One started to hum like hell and the other one additionally made a highfrequent "ckicking" sound. I removed both of them from the tank, put them apart and cleaned them with care. Further more i inspected the parts for any abrasion or damage. There was no damage nor any visible abrasion. Finally cleaning helped a bit. But both pumps are still annoying loud. Is there anything more i can do? Except for buying new ones? Cheers, Nikolas

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