Very cool. Thank you.
I also was wondering how many liters of air you pump in. If I remember right, you converted that skimmer to be an air stone skimmer?
i really don't know and dont care', it's working and that counts for me.
i have a 1800liter/h pond airpump to power 4 airstones, but i regulate it by blowing off excess air through a dummy air stone.
these are the specs:
Velda Silenta Pro 1800 25 Watt 0,025 MPa 1800 l/h