Pretty far down ... only a little over 3" but CF =24 so the fact that it was cooler after the rain kept the transpiration from being too high. Topped the system off with water and that took the CF down to CF =17 so I added a cup and a half of nutrient ... at 1.5 per quarter cup that should bring it up 7.5 points to about 24.5 or thereabout. I'll check that later after it reaches equilibrium.
Surprisingly it only went to CF =22 so I'm curious about that. The temperature went up to a whopping 96 degrees F today, peaked a couple of hours ago and it down to 91.6 now. (19:16 hours).