How does an air bubble in the cell affect performance and salt level reading?
Should the system be shutdown, water drained out of cell then restarted if a bubble is trapped?
Bubbles can get trapped at startup after draining but a restart may eliminate it.
Does that imply that installing the cell "Down" on horizontal piping is recommended?
https://www.circupool.com/assets/doc/...
Page 5 implies that Cell is installed "Up" for horizontal installation; page 14 Figure "2" shows that explicitly; page 15 main figure also shows that explicitly. Bottom of page 15 shows an exception where it is installed "Down" when "NOTE: When using a Variable-Speed or Multi-Speed pump on a low speed setting, or for general circumstances where flow is less-than-adequate, the cell must be inverted in order to ensure adequate flow & efficient chlorine production.
The normal "up" condition is susceptible to getting air bubbles trapped.