I have just checked my PH and it is already 8.5 high, 24 h after being 6.5. I think that the bubbles go to the rockwool and go back down to the fert /water solution with a high PH. I don't think that i have to balance my PH every day...
I did not have this problem with waterfarm and vermiculite. Any one with bubbler/rockwool experience ?
Thanks
Fhydro