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I bought a Bosch dishwasher recently (about $800). It works much better than the old GE one which had hard water deposits and the design doesn't allowed it to be cleaned easily. In contrast, the Bosch has a removable strainer (not typical in American cheap dishwashers, but is featured in Reader's Digest repair guide) that should make maintenance easy if needed. SO far, the dishes have never been cleaner. Other plusses are the quiet operation and energy savings.
I've been keeping fishes for 20+ years, including breeding pedigreed goldfishes, bettas, cichlids etc. The easiest and least maintenance filter I have is my present setup: none. ... actually it's java moss (tons of them) in a 100 gallon tank. I change the water once a quarter, and the only maintenance I do is to refill water lost to evaporation and to remove excess java moss. I know the latter is excessive when the fishes can't swim around but are trapped by the moss. The fishes are low maintenance fishes like comets, shubunkins caught from my pond with plecos and some SAEs.