I've had my GS3 for a few years now. I do use it pretty heavily. I've run near RO bottled water for about 2.5 years, now switched to plumbed in with softened water and a Chris Coffee carbon filter.
Recently, I have begun to notice that my drip tray fills in less than a week. Previously, it would only half fill in a weeks time. I contacted Chris Coffee and they said that my household water pressure was too high. As I think about this, I would guess that it was at least 3-4 months after switching to plumbed in that the drip tray began to fill more rapidly. I contacted the builder of the home, who blew off the concept of too high water pressure. He said he's never had anyone complain about water pressure too high. If it was, I would be blasted out of the shower. I could just follow Chris Coffee's advice and get a pressure regulator for the machine, but there's a part of me that is not sure that is the problem.
Second problem is that I have begun to notice that the steam wand itself (not the valve/lever) will leak a bit after steaming. It can be made to cease by flipping the lever a few times. But, it is worrisome. I've found some reports of leaking around the valve/lever on the web, but not this.
Filling the drip tray, .... well mine is emptied every day (drains it's self actually as it is plumbed in) and I advise you to drain every day also. As to the water volume it entirely depends on how much you flush for cleaning the grounds from the group head, for washing the group head and for any thermal stability issues you are dealing with so this will change from person to person and it is not a useful measuring tool.
How long has it been since the machine has had service and been descaled?
The dripping steam wand or continued steam, sounds like the seal in the valve is wearing out (it happens and is called normal maintaince) so you might want to look into a rebuild kit for the machine.
My home water pressure is low (about 30 psi on average) due to where we live but if it were much higher I would be running a pressure regulator on the water supply for consistency sake as well to reduce wear on things like valves ect. When using line pressure to pre infuse, you likely are a bit high on the pressure also and you may not be getting the full value from your coffee or machine. YMMV!
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