Why is my Emperor 400 making loud noise?

I came home today, and my Emperor 400 filter is being unnecessarily loud. It has been silent up until now.

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The most common issue for this problem is a dirty impeller. Please use this troubleshooting guide to assist you with how to clean your impeller: Marineland Emperor 400 Power Filter Troubleshooting You must simply first shut off the filter and remove the main intake line to get to the impeller by pulling up on it while pushing down on the two spray bars. Under this will be another piece to lift up which should lift the impeller out with it. Thoroughly clean the impeller with warm water and your fingers or a cloth and use the provided pipe cleaner to clean out the compartment where the impeller sits in the filter. This should resolve any noises or rattling coming from your Emperor 400. Reassemble the filter and power it back on.

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