roots need air?

So I just bought and have been reading the big hydro book from this site and I'm confused. In the big bubbler pot set up it says that once there are roots coming down from the pot, then lower the water level so they don't rot because they need air. So how do the roots get the solution if they are not touching it? And why would they rot sitting in the water if the lettuce raft ones are in the water all the time?

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Jan 12, 2015
Bubbler air Root Question
by: Memwl

I use Bubblers all the time, In fact I put some pictures on this site, Mu Comments are The roots won't rot submerged in water as long as there is enough air infused into the nutrient, If your roots are dangling in the air there will be some in the water below, these become your feeder roots and the other become air roots, And next if there is a power failure the one with the air roots will survive and keep growing, there are certain plants that will survive just like that, Cucumber is one of them, no air pump just roots hanging into the solution.

I hope this answers your question, Google or Bing Hydroponics with air roots or similar phrase.

Good Luck

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