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Depends on what the makeup of your water might be but when you have hard water, there is a buildup in filter parts. Not really anything to worry about other than when it lands in the tank it may look messy. Same thing you find in a coffee pot or tea kettle when they have been used for a while. For both the HOB and the canister, it will be important over time to clean the area where the impeller sets. It doesn't have to be every time but over time these will get full of algae and gunk and stop the impeller if not cleaned. I use a Q-tip to get down in the little hole.
 
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