Expected primary: 1.943e-5 (15/772200)
Each trackloop advances 1 per tape. The salt only reaches the end (conduit 2), causing one output, if all five trackloop arms are in the starting position; otherwise it resets to the start (to conduit 1 at left).
The trackloop lengths are 5, 11, 13, 8, and 9. Their lcm is 51480, so we get one output every 51480 loops.

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Actual notes:
My first time playing OM in years. I watched the tourney videos and thought it'd be cool to give it a try come weekly season, so here we are.
I'd always thought this metric idea (min throughput on capped area/period) was cool. A prod chamber isn't enough space for me to even want to try to do any of the actually cool ideas, so I'm just going to leave that to the people who are actually good at the game.