Hi, I could really do with some advice right now on how to fix my issue. Before I start I’m not a plumber or anything like that so I would be very grateful for any help. Recently In the house I’ve been hearing loud foghorn type of noise coming from the cold water pipes and feel a vibration. I have to constantly keep flushing the toilets or open cold water tap in the sink for the noise to go. I read lots that usually the noise happens when people flush their toilet however I get the noise once the water has filled. I’ve replaced the diaphragm valve in the toilet but the noise still came back. It’s not all the time but randomly appears throughout the day so to stop it I flush the toilet a few times, open the tap in the bathroom and eventually it stops. After I changed the valve and while the noise was happening, I pushed down the ball float so water runs into the cistern and noise goes but as soon as I lift the float to stop the water, the noise comes back again. Does anyone have any suggestions? I would really appreciate all the advice I can get.