That is why I was wondering, due to the collection of debris. I do not use carbon, unless it is for a specific reason, which isn't often. My aquaclear sponges seem to really collect it in my tanks. I am a once a week or two rinse in tank water in bucket, maintenance as often as needed and all. It seems some months that I have to completely clean out the entire box, impeller and all.
So do you just carefully remove the planted media (or pieces) when cleaning must be done?