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This is a bit late, but there are ways to reduce the amount of maintenance you need to do on a koi pond with a bit of investment and technology. Most koi ponds in Singapore are built using brush and mat filters, which require maintenance every two weeks for optimal fish health. These are pushed for mainly one thing - maintenance costs pond owners will pay "professional" cleaners to do the dirty work for them. Modern easy maintenance (5m every two days, hands dry vs 4 hours every other weekend, whole body soaking wet) filters can be easily retro fit to a koi pond. There are a few schools of thought to achieve this.. If you haven't already destroyed your koi pond, I'd be happy to share with you some possibilities. A video from my self cleaning pond is below. Crystal clear water down to 5ft, no mats or brushes to clean. I inspect the system mechanically once a month for wear and damage. There have been mechanical issues with my filter the past couple of years, but these have mostly been sorted out. This was a small price to pay for the self cleaning aspect. If you can go without crystal clear water, a simpler (manually flushed, and far cheaper) particulates separator can be installed that has no moving parts. (Google Ultrasieve)