Not questioning your experience or anything like that. I just hit the reply button rather than the quick reply, so it showed you up on it.
Basically, this is a good indicator that using the % scale is misleading at best. Concentration in solution is much more accurate.
After all, Oxygen dissolved in water is what the fish need, rather than the percent of oxygen that is in the water, not actually dissolved in it. Henry's Law. Requires pressure to pull this off.
Like it really matters!
Oh darn. I hate to disagree with you again but maybe I'm misunderstanding you. To me % saturation is more relevant than mg/l due the the fact the mg/l means different things at different temps.
If I've got 6 mg/l in 38 degree water in an open pond something's wrong. If I've got 6 mg/l in 90 degree water it wouldn't concern me.
