Ray, thank you for proposing this. This might me a suitible candidate for a hot filter! Culd be placed right at the drop box.
Allso, l like that video a lot. You got to trying it your self?
I finished the automixer today. This is what l came up with.
The membrane is a thick plastic foil, reinforced with a thin metal disc.
The valve is a kind of a gate valve. The idea was that l wuld make it compact and as simple/foulproof as possible, and this seems superior to a buterfly valve in those aspects. Reality will be shown soon
On the video it seems like l am holding the automixer in a huricane, but in fact l was only blowing on that small hole and as you can see it can esyaly move the plunger up and down. Looking forward to test it.