Anytime a DWC/RDWC cannabis grower cannot insure minimal safe DO saturations 24/7, that grower is in a world of dung. Most growers never know when he has low DO problems until the plant wilts then the roots get sick and die, then they rot and decay. Then the fungi colonize and eat the decayed mess the grower caused. Then there’s that that Eureka moment, there’s a problem here this morning. Its’ way too late by then; know what I mean? Most growers claim they never have any problems or worries about root rot or fungal infestations with their DWC set ups. Some experts say fungi attack the roots and kills the roots, others say the cause is warm res water and a few claim the root problems are caused by the low dissolved oxygen and the roots simply suffocate. That problem is caused by the grower’s failure to insure minimal safe oxygenation with his/her DWC life support system. The water chiller salesmen says that the only way to increase the DO is to chill the water, buy my water chiller because the DO chart proves this up. The air pump and air bubbler salesmen always say, buy a bigger air pump, buy more bubblers, got to pump more air to fix a low DO problem. More air means more oxygen is a common myth and misconception promoted and believed by many hydroponic growers. And the water wall promoters say use a triple water wall system to fix a low DO problem. Then there’s the chemical promoters say, “got to use H2O2” to increase the DO. Hook up and air venture to your water pump, more oxygen guaranteed, yada, yada, yada humbug! Test your DO saturation and see for yourself how much difference all this stuff really makes. Air is 21% O2 and that is the limiting factor of the DO charts, regardless of how much air you want to pump through your bubblers. But, there are other novel oxygenation methods that will definitely increase the res water DO saturation called oxygen enrichment with elemental oxygen > 24% O2 concentration. So what DO saturation would you really like to have in your res water 24/7 for months? 25% DO saturation, 50%, 95%, 110%? Supplemental oxygen enriching O2 devices used in hydroponic applications that will insure (guarantee) safe oxygenation that really work: 1. High Volume Oxygen (HVO), an approach to DO is to steer clear of chemicals (such as hydrogen peroxide), poisonous gases (such as ozone), and small-scale / high-cost electrolysis, favoring a safer, more natural, and more effective method: compression. Henry's Law explains the quantity of gas absorbed by water. It shows that the oxygen in water increases in proportion to atmospheric pressure. This makes it possible to combine water and oxygen under pressure to create high levels of DO. 2. Electrolysis of water 3. PSA O2 Generators 4. VSA O2 Generators 5. There are many other supplemental gaseous oxygenation devices that work well It makes little difference about the particular device or product used to deliver the vital oxygen gas, this is specifically about gas everybody talks about on forums. It appears to me that insuring continuous minimal safe DO Saturation 24/7 in any DWC/RDWC hydroponic life support system is always the growers total responsibility. And it makes no difference whether the hydroponic crop is carrots, cabbage or cannabis.