Hi Folks, first post here.\n\nI have an approximately 8,000 gallon koi pond. I can get a really good deal on a Aqua Ultraviolet Ultima II 20000 Filter. This filter is meant for ponds between 10K-20K gallons. My question is what would be the downside of using this filter with my 8K gallon pond? I was thinking one of the downsides would be the amount of water I'd need to use to backwash and rinse the system but at the same time, I imagine I would not have to clean the filter as often. What do you think and are there any other reasons not to go with this size?