It's definitely noise from the sump. The water splashing. The filter sock is about 2-3 inches into the waterline. When I pull the sock upwards, the noise stops.
Also, the elbow has a hole in it already with rubber tube that goes upwards acting like the durso already. I was planning on running a 2x durso near the sump as well, but trashed the idea.
Also, the elbow has a hole in it already with rubber tube that goes upwards acting like the durso already. I was planning on running a 2x durso near the sump as well, but trashed the idea.
Last edited: