^^^^
Gotcha! Cheers! 
No wonder - I've been running with it fully open. Very illogical design for doing things imo.
Actually..It's very logical...
if it is tightened against the can.... it will rattle undone and sit at the lowest point of it's thread.
If, however, it is "undone" fully to the bottom of it's thread... it's go nowhere to rattle undone to.
Make sense?
....Yes, the 'rattle-undone' precaution does make very good sense. It's only that
our my brain is so hardwired into closure being both clockwise and against a surface. Also 'loose' equals 'open' in my brain and it doesn't tighten until the very bottom (tight arse?). There's nothing to inform the consumer about this in the instructions pdf.
I'm sorry but I'm not a 'hater' of this product but just critical of how BSH haven't bothered to think it through enough imo. The tank itself is very utility in its design appearance but the whole kit is very competitively priced.
[I'm possibly changing mine today and will post a new thread]
