Well it was day 49 for all the plants, and for 5 of the 6 screens that means its time to start a flush. I've ran through a mixture of Dextrose and sugar (clearex solution). After that I ran straight tallboy filtered water through the plants (~200ppm).
Here is the before PPM
This was after running the 55gal dex/sugar mix (~200ppm) recirculated through all 36 pots . As you can see the dextrose/sugar mix appears to be pulling out a fair amount of salts.
Sativa Screen at 49 days of flower (needs another ~20 days)
The left side is Sour Diesel, middle is chocolopez and the right is Liberty Haze
Blue Kush Net, there are probably 3 I need to run again after THC tests on the buds