Mac, no disrespect intended, but it’s clear that DO% Saturation is something really new for you and your absolutely correct, a tool to measure the DO % Saturation is absolutely necessary to test and measure DO % Saturation. Without the tool, there is only hope and hope. When hope fails and roots suffocate, die, decay, you can expect the dreaded fungal outbreak because that is predictable.
What do you think is more important when it comes to sustained minimal safe oxygenation for 2-25 mature DWC cannabis plants and 2 pounds of beneficial microbial colonies, 8-9 ppm DO or 100% DO Saturation or thinking out of the box - what about 12-15 ppm DO concentration @ 100% DO Saturation and 5 pounds of microbial colony?
DO % Saturation - The standard unit of oxygen saturation is percent (%). In aquatic environments, oxygen saturation is a ratio of the concentration of dissolved oxygen (O2) in the water to the maximum amount of oxygen that will dissolve in the water at that temperature and pressure under stable equilibrium.
Oxygen saturation is a relative measure of the amount of oxygen that is dissolved or carried in a given medium. It can be measured with a dissolved oxygen probe such as an oxygen sensor or an optode in liquid media, usually water.
DO Concentration (PPM DO or mg/Liter) – Dissolved Oxygen is the amount of gaseous oxygen (O2) dissolved in the water.
DO concentration can be measured by colorimetric methods, a sensor and meter or by titration. The colorimetric method offers a basic approximation of dissolved oxygen concentrations in a sample. … The traditional method is the Winkler titration.
Many things affect the DO Concentration (PPM or mg/L) and DO % Saturation (20% Sat, 50% Sat, 90% Sat, 110% Sat, 140% Sat and so on… fractional concentration of oxygen, barometric pressure, partial pressure of oxygen, water temp, salinity concentration or solute concentration and the oxygen demand of plants and animals consuming dissolved oxygen living in the water.
**“BTW, if you can’t keep reservoir temps this low, it is really hard to keep DO levels high enough_**_.” IF sounds like hope… What DO Sat is high enough, safe, constantly sustainable for months of the growing season?
Eliminating “IF” and “hope” of sustaining safe oxygenation continuously without low oxygen insults is not possible when you limit yourself with air, DO Charts and water chillers until you can think out of the box and use Henry’s Law - In chemistry, Henry’s law is one of the gas laws formulated by the English chemist William Henry, who studied the topic in the early 19th century. … In other words, the amount of dissolved gas (oxygen O2) is proportional to its partial pressure in the gas phase. The proportionality factor is called the Henry’s law constant.
Pro football players, doctors, nurses, EMT’s, fighter pilots, welders and plumbers, SCUBA divers, jewelers all apply this Law every day to exceed the exceed the oxygenating limitations of air. There are many occasions when air simply is not capable of satisfactory oxygenation. Air is mostly Nitrogen gas. That’s why hospitals use oxygen vs. big electric fans.
Manipulating DO Concentration to insure 100% DO Saturation – air is seriously limited when it comes to minimal sustained safe oxygenation for months in DWC.
If plenty of air, chilled res water would really insure minimal safe oxygenation continuously for months, there would be no low oxygen insults, root balls and microbial colonies would be healthy. Low oxygen events, suffocation and death and decay would not offer opportunity for fungal feasts. Prevent the fungal outbreak and insuring healthy eco systems seems more positive than waiting for the outbreak and trying to kill the fungi and save sick and dying plants.
Many growers claim they never have worries or problems with fungal outbreaks. Do fungal outbreaks concern you, are you into preventing fungal outbreaks by insuring minimal safe oxygenation continuously or treating outbreak aft they happen?
The difference between DO Concentration and DO % Saturation are simply 2 different ways to evaluate dissolved oxygen in water.
I still have the same 3 initial questions:
Does anyone have any idea about DO Saturation range to insure optimal root ball and microorganism colony oxygenation?
What the optimal sustained dissolved oxygen saturation range that insures healthy plants and excellent “bennies” microbial oxygenation?
What DO saturation is considered “low oxygen” inviting fungal outbreaks and infestations?