I didnt clean it. I normally clean them every six or so weeks. I just walked up and noticed that it was not working. Not even one of the turn it on and have to help it along happened, like happens with my tunze every so often. Just wasnt working. Tried unplugging and plugging back in, didnt work. Tried to soak it in vinegar and scrub it, didnt work. So, its just sitting in vinegar now. I got it at aquatek. I will check tommorrow if they keep a receipt in their system. I am wrong, its actually 15 months old. How time flies. I think they have a two year warranty??