–Played around some with the pool. Seems fairly certain that at least the main pump (probably both) has to be at 3000 RPM to prevent air bubbles. I finally got a good idea of what the solar porthole should look like when all is good: it should look like there’s nothing in it.
–Roasted some caf beans. Had too many in the second batch; the chaff actually caught fire (inside the collector) and turned to ash. Oops…