After many consecutive triple digit, low humidity days this summer, it became clear that the transducers had bigger problems  that replacement didn't fix.  They occasionally have to be cleaned of scale.  The transducer which was replaced in june continued to be the problem child.  

That one got a new transducer & board in June but it still tended to get into a state where it would die, the button would have no effect & no amount of whacking got it to start.  It would start once per day & not again.  Replaced its board with yet another board & got some promising results.  These boards are so cheap, they're not worth troubleshooting.  It subjectively looked like insufficient voltage.  The spare board supply is now down to 2. 

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Pointing the transducers sideways more seemed to improve results.  They were originally in a sideways mount so they probably have to be fixed that way instead of on a variable tilt.  The spray would all go sideways or down to keep air bubbles from forming.  The overflow would now run straight down & it would have to be in the center of the sump.  It still needs a gutter to keep the wind from blowing it.

It's going to require a taller stand.  The taller stand needs a counter weight, a way to farsten the water hose & power switch to the base.  

The peak heatwave was intense enough to flatline the humidity even with the swamp cooler on.