Found this at:Our hotel in Healdsburg had something similar, only much simpler (or so they claimed). For #1, just push the plunger the ordinary way and get a little flush. For #2, hold it down a while to get a BIG flush. We only stayed a night, so I can't really vouch for it.
http://time.blogs.com/eye_on_science/
If you've got a #1 kind of thing going on, you press button #1. For #2, #2.
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