Quote:
Originally Posted by Slick Fork
The trouble with that statement though is that you are looking at the skimmer and sump drop foot prints as 1 dimensional when in fact the water in the skimmer or falling into the sump is surrounded by bubbles. I would be willing to bet that if someone much smarter then me figured the amount of "surface area" the water in the skimmer has we would all be floored.
As anecdotal evidence, I can point to the common practice of basement tank owners hooking their skimmer air intake up to a fresh air pipe and watching that fresh air alter the Ph of the tank. Also I would point to the method in Fresh water of CO2 injection via a bubbler again, changing the Ph through the gas exchange between the bubbles.
Not discounting the gas exchange that occurs on the surface of the water, I just don't see how that could be greater then what occurs in the skimmer.
FWIW, when my pumps go into night mode I keep the same patterns and just drop the flow by 20-25%
All IMHO
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It wouldn't be too hard to get some idea of the oxygen levels in a tank over a period of time. Anyone with an ORP meter would get a good (if not exact) indication of this. All such as person would have to do is monitor ORP levels at night with:
1. the skimmer on and pumps on full
2. the skimmer on and pumps on night mode
3. the skimmer off and pumps on full
4. the skimmer off and pumps on night mode
Then compare the results with daylight readings.