Quote Originally Posted by GaGrown
It says on the bottles... KEEP FROM FREEZING TEMPS. Store at room temp. The nutes will solidify. How long have you been doing this? Is it a shock on your roots in the res.? Just curious..

Ga.
I believe the statement on the bottle refers to the bottles concentrate of neuts. A frozen tray (1qt) then thawed, ppm tested slightly lower but 2 drops of CalMag brought it back to where it started. There would be more crystalization in the concentrate. I haven't come across a problem as long as the neut level stays high enough so that the cubes don't get under it and into the root sytem. I'm looking into a simpler method, an AC is definitely in the plans for next summer. Make a chiller from my small office size fridge is my next project.