Dissolved Oxygen is the amount of oxygen that is dissolved or carried in a given medium.
Testing Procedure:
- Pour 250 ml of tank water in a testing vial.
- Remove ampule from box
- Place in vial and press down with enough force to break the tip, it will turn a shade of blue
- Swirl chemicals gently, wait for 2 minutes
- Compare to test examples
Water with less than 3 mg/l will not support any fish life
Above 5 mg/l is good
The dissolved oxygen level in my ecosystem is about an 8:
I think for a small pond, a 5 or 6 would be good.
For a large river I would expect maybe an 8 or 10.
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