You just may have answered all my questions, i was wondering if i would have to add lime to ffof as it would flush out after awhile. at the end of my grows in bloom the ph is always so drastically low and now matter how much i flushed,, the flush always did more dammage in my opinion.
4 week into bloom is when i notice cal-mag def. and it progressively gets worse even with lots of flushing and 1/4 strength nutes. I started adding in cal-mag and it was making it worse or if not any better. Due to low ph.
I Started spraying with cal-mag 1/4 tsp per gallon and it did more damage than good, it made my leaves dry.
My ppms are always low when i feed. People started saying flush if your soil is too low in ph because of too much nutrients built up. When I tested my ppm runoff it was only at 4-600ppm range in a 2 gallon pot with 2 month old plants.
Even with fresh soil strait outta the bag the ph is low with 6.8 ph water only ran through it, it came out at 5.8. i use to like FFOF until i started getting rusty nails and dirty bloody band aid's. but over the last 2 years i have bought it the mix has gotten shittier and shittier.
I've used Fox Farm's nute line up as well as brewing my own teas, now onto H&G soil line up. Still have the same end results