Quote Originally Posted by hbbusa28
Is that still the case with Rockwool? I've heard that the Rockwool holds a good amount of o2 so there is no need for a stone. Is that true?
Yup.
You're putting oxygen into the nute mix,... not the rockwool.
The mix that flows over the rockwool needs to be 'oxygenated'.

turtle420 Reviewed by turtle420 on . Quick Question on Airstones? Hey, I was wondering how important it is to have a good airstone with fine bubbles? Because I am modifying my system and I need to add 8 new airstones... and I would rather not spent $50 per airstone for the ones that produce fine micron bubbles. What is an acceptable micron level for growing plants hydroponically? If anyone has found good cheap ($20) airstones that work I would be forever grateful :stoned: Thank you all for your time. Rating: 5