best koi pond design!

This is my koi pond, uses a 4 bottom drain and settling chamber 3000gph pump and a 3x6 bog filter for cryst clear water all summer long with out using chemicals or UV light, best design I have ever made. It requires the settling chamber to be cleaned out one time a year, thats right one time a year, do you know any filter that you dont have to clean, I also do water changes to maintain clean water and for faster growth of the koi. enoy