I did the same thing. I had a Whisper 1 power filter. I used to change the cartridge about once every 2 weeks, and scrub the filter clean once a month. I'm sure I caused a lot of mini cycles back then.
I know back in the late 70s, when I was in grade school, I was told that you needed to completely take your aquarium apart once a year and scrub everything clean. This, of course, caused no end of havoc on the fish.
God bless my Dad for continuously driving to the store to constantly buy new fish when the old ones died.