I own a Iwaki MD55RLT and have had it now for a total of 14 months. Yesterday, the pump started making some incredibly horrible noises. First, checked to ensure that nothing was caught in the impeller. Next made sure that the fan wasn't hitting the casing. Next, I called Iwaki, who basically told me: "...tough luck. Sounds like a bearing. Our pumps usually last four to six years, I guess yours didn't, but it is out of warranty. You'll need to buy a new one." Not a chance in hades will I EVER buy a Iwaki Pump again. Mine didn't last very long and all they could say is "sorry about that". If you are going to buy a premium pump at a premium price, you would expect premium service. NOT from Iwaki.