Randy Holmes-Farley
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FYI, I had that stirrer. I also have a lab grade portable conductivity meter. The concentration of kalkwasser is highest right when you first fill with water and add kalkwasser. The concentration of kalkwasser just keeps dropping and dropping after that, even with a bunch of excess kalk at the bottom of the reactor. The stirring isn't enough. It seems there is something going on that causes concentrated kalk to stay low.
That's why (one reason) I don't care for reactors. Many people just mistakenly assume it is saturated and often it is not when they actually measure it.
Kalkwasser dissolution is not super rapid. Even in a fully mixing container with loads of fine particulates swirling all through it, it can take a fair amount of time (many minutes) to become saturated.
Also, eventually the solids that remain may be mostly calcium carbonate, so seeing solids remain does not mean their is much calcium hydroxide left to dissolve.