How important is it to flush my hydroponic system with plain water for 3 days

A customer has a question and I hope we can get some opinions on it, thanks

Hello I am ready to harvest and want to ask how important is it to flush my hydroponic system with plain water for 3 days, ( I think I read this somewhere) before I cut. I am asking because the leaves are drying and dying on the top branches.

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@Donaldj is our resident hydro guy
I am in soil and have no clue!

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you can get away with 24-48hr flush if you have been dropping ppm during last week or so

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