Yes, I dump the batch every other day. The salts are pulled into the water by flawless. The roots sit in it for days.
My theory is to provide a cleaner solution to the plant as much as possible during flush. I think it produces a cleaner harvest than just waiting.
Have you ever been really dirty and you took a bath? You sit in the dirt that you washed off… I drain and fill the water several times during the bath so I don’t soak in my own dirt.