Desertboy
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I have an ORP controller google it for more information it basically tells me how much O2 is in a usable form in the reservoir. Higher== more O2
The lower figure is 4 12" airstones with a 40l/min pump
the higher one flooming only
With flooming and airstones the ORP was within 5 points of the flooming alone (It was lower) which is close enough to be within natural variation.
Reservoir is temperature controlled which will have the greatest effect on ORP.
Conclusion airstones and airpumps aerate the reservoir 20% less than flooming while increasing the pathogens in the reservoir exponentially.
I have a plant on the go with a DWC without airpumps or airstones
The lower figure is 4 12" airstones with a 40l/min pump
the higher one flooming only
With flooming and airstones the ORP was within 5 points of the flooming alone (It was lower) which is close enough to be within natural variation.
Reservoir is temperature controlled which will have the greatest effect on ORP.
Conclusion airstones and airpumps aerate the reservoir 20% less than flooming while increasing the pathogens in the reservoir exponentially.
I have a plant on the go with a DWC without airpumps or airstones