I store sorted and marked seeds in containers in a refrigerator to keep my cannabis genetics. Seeds may also be stored in air tight containers with desiccant in a freezer for long term storage. Always allow cannabis seeds to warm to room temperature before exposing the seeds to the humidity in...
I have been told not to go all the way to 0 ppm - to leave a good 25% during flush
A higher ppm of nutrients can be pulled from the plant with a low ppm solution then a 0 ppm solution and is often why a harvest flush agent is used.
Here is a recipe for a home made Clearex Flushing...