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Might have some air stuck in it still. Try prime it again, tilt the filter slightly and gently rock it back and forth if it carries onHi all. Just cleaned my external filter for first time. All of a sudden there is a trickling noise inside the filter. Why is this and how do I stop it?
Id say youve definetly got air in it. Stop it, take the lid off and make sure everything looks in place, impeller etc and the lids sealed tightly and prime it for a good while again. This happen to mine and it did stop once id got the air outTried that it's worse now