[Flick Lives]

The diagram is deceptive. There are several of the pipes which are blocked.

#9

[mairdie]

Article says no.

[Flick Lives]

Dammit. Just realized #9 is also blocked.

This puzzel is really a puzzle by mis-direction. You start thinking about the level of the pipes, and how water flows, missing the tiny blockages set in place in the diagram.

[Mercat]

9 is blocked.

[FreedomPoster]

9 is blocked at the very end. I missed that, too.