Final Flush Using R/o Water

[EverAfterOC]

I am 2 weeks away from harvest and I need to start doing straight H2O. Since R/O strips everything from the water, should I add a small amount of Cal-Mag to the flush? Or just ph'd R/O?
Here's part of my progress.

 

[3N1GM4]

I wouldnt add anything

 

[3N1GM4]

Wow

I am 2 weeks away from harvest and I need to start doing straight H2O. Since R/O strips everything from the water, should I add a small amount of Cal-Mag to the flush? Or just ph'd R/O?
Here's part of my progress.

 

[EverAfterOC]

I have been hearing conflicting opinions on how long to final flush. Some say 1 week, others say 2 weeks. I am in soil (empire builder). Any thoughts?

 

[3N1GM4]

At least one week is what I try to do