We had a koi pond dug out about ten years ago. It’s been an amazing addition to our yard, but we can’t seem to find a pump that survives more than a year or so. We’ve got about three koi (about 14-16” each), and a catfish (16-18”). The pond is a kidney shape, about 8’x9’. We live in northern New Jersey, so we get four distinct seasons. The first pump gave us 3-4 good years, but since then, their life cycles seem to get shorter and shorter. The past two have only lasted 6-8 months. The one that we have in there right now is a Tsurumi 50PN2.4S, but we’ve tried all different models. When the pond was initially built, it had a Tsurumi in it. They all tend to die during the winter or in the early spring, but we’ve had them die in the summer and fall, as well. This one sounds like the impeller is seized up, but I can’t tell. It sounds like there’s electrical current running to it, but that’s it. Is this something we’re doomed to repeat, over and over each year? If so, can you take a stab at what you think is causing the issue? The pond is taken care of well and is cleaned fairly regularly. During the winters, we tend to throw in a de-icer and run the waterfall throughout the season. They’ve also tripped our GFI in the past as well! I’ve attached a picture of the pond, as well as a shot of the pump compartment. As you can see, some algae is already starting to build up. Please help in any way you can, whether it’s advice, your experiences, or something else.