Why is my HOB so loud?

[tommybhermitage]

I have two ac110. One is super quiet one is very loud, and I have a 75 tetra I think? And it is very very loud. Anyone know why?


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[joe jaskot]

Noise is usually caused by a clogged (dirty) or worn out impeller. Take the filter apart and clean the impeller. If that doesn't work, you may have to replace the impeller.

 

[ska_kid]

Mine had hair stuck in there

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[muskieboy]

Rinse the impeller and coat it in some petroleum jelly.