What is the “safe DO Saturation Range for DWC-RDWC hydro pot grows?

[JohnM]

My question is not about water temp, air pumps and air bubblers, water chillers, cold water or the DO chart says yada-yada… it’s about serial measurements of dissolved oxygen throughout the growing season, DO Saturation tested with a real DO meter.
Of course minimal safe sustained oxygenation is vitally important insure healthy root balls and beneficial microbe colonies in hydroponic pot grows, DWC as well as RDWC grows. That minimal safe oxygen saturation must me sustained continuously 24/7 for months in a perfect growing world.
Thanks

 

[Douglas.Curtis]

Add pumps until the pH of the solution starts going up, then shut off pumps until the pH rise stops happening. That's the maximum regular air you can pump into it. Contrary to popular (cannabis forum) belief, airstones are more effective than open lines. Proven by DO tests done in other industries.

Co2 in the air causes the formation of carbolic acid, when pumped through water. Too much air and the rise in pH causes problems.

 

[mojave green]

Roots like oxygen from the air, not the water.