Back in the early 80's when I was a 13 y.o boy happened to buy an Aquaclear, I dont remember the model but think it was the old version of the current aquaclear 50.
That little box proved to be a warrior running and running with minimal maintenance and a rough hadling from me, lol, I was surprised how that filter worked out in overcrowded tanks, keeping always water clear and live fish.
After several years I ended up giving it away along to the rest of my equipment and fish.
Now I have two AC's one 70 and one 110 but 70 is barely a year old and 110 is new.
Cheers.