I don't flush and I use it, as it is used at between weeks 7 and 8. I always let my plants go 10-15 week's to get some nice ambers and the buds swell up pretty nicely. So I belive that it is gone by then.
Hope this helps you.
I use the whole line up of the Dirty Dozen, except the Sledge Hammer ( it about killed all my plants the first time I used it).
Just for the last week or so I just give plain water no flush, it works for me and many other's here that I've talked to.
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