Absorption of CO2?  See if pH changes as well.

Marshall

Steve Young wrote:

> Hi list, I have noticed when I make CS (LVDC method, pure DW, no
> additives), the conductivity of the end product drops during the first
> day.  I measure the conductivity with the Hanna PWT immediately after
> completing and stirring a batch, then the next day.  Here are some
> readings to illustrate this.  They are after - next day, in
> microSeimens:  23.8 - 16.0, 19.2 - 10.5, 22.6 - 16.2, 10.0 - 7.8. What
> is going on during the first day to cause the drop in measured
> "strength"? --Steve