If plants can be over watered, how does hydroponics work?

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Plymouth, Devon, England

Question by PlantersCashews: If plants can be over watered, how does hydroponics work?
Probably a dumb question, but I was watching a video on how if leaves are yellow, they’re over-watered. If this is the case, how does hydroponics work? Aren’t they ALWAYS over-watered? Or are they special breeds designed to be in water.

Thanks!

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