I don't know what kind of filter you have, but sometimes I have a problem when restarting my power filter. I fill it up and it makes a sound like it's not getting any water. The only way I can get it to stop is to first make sure it is on the highest flow setting and make sure the is water in it. If I pour water in the container it will stop sucking.
It is a good idea to check the impeller, sometimes pieces of charcoal from my filter can make there way to the impeller, or other debris, clean that out. Make sure none of the tubes are clogged. Also if you have filters in there make sure the water is able to flow through it, if my filter fills with too much water it stops sucking.
I hope you can figure out what's wrong, good luck!
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