Just finished filling up my new Waterbox 130.4 and so far so good for the most part. My main issue is my felt sock filter, its too noisy. It has the silencer but I still get a bit of running water noise. I have increased flow and decreased flow, keeping the over flow box levels in check, and I still get the noise. I am not sure if this is indicative of anything with regards to sump water levels or just a new normal I need to get used to. Any possible suggestions on cutting back the noise?