Give it a try again ttavasc
, I just make the video public. From the location, it sounds like your issue is the same with mine. However, I can not replicate this issue again, since I now just leave the grey tank valve open when some one take a shower.
If this problem is the same with yours , I would think that it does not matter of the grey tank valve is opened or not, the leak would still happen right ?
By the way , in your case, does the leak cause rot on the wooden structure ?