A good graph for calculating D.O saturation values in percentage rates is available in the link below ...
In order to convert dissolved oxygen in parts per million (ppm) to percent saturation (%sat), the water temperature and barometric pressure or altitude are needed.
TDS whether high due to salinity /minerals/carbonates etc take up space which prevents Oxygen saturating more fully than if the water were pure ...
Cold water holds more oxygen than warm water. For example, pure water at 4°C (40F) can hold about 13.2 mg/L DO at 100% saturation, while pure water at 25°C (77F) can hold only 8.4 mg/L at 100% saturation. Water with a high concentration of dissolved minerals cannot hold as much DO as pure water.
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http://www.fivecreeks.org/monitor/do.htmlThat said .. the addition of salt due to it`s chloride ion (calcium chloride is an alternative) is imperative during cycling with high Nitrite values in order to prevent methemoglobineamia ...
With the Tds that comes from my tap and the report from the water authority over here
i am quite amazed that there is room for any oxygen in my water.
