Don't have an airstone...air pump to drip ring....I'm sure its the hydroton because it's the only thing different. Are you going to try the coco? I've heard about some weird issues with it and so was afraid of it. Also did not want to go timed watering the way you should with coco I'm told.....for me it just seems like one extra thing that could go wrong, lol.

Sharing do you use ro water?
Weedhound Reviewed by Weedhound on . Has Anyone Else Had This Problem with Hydroton? It's raising the ph of my water in my hydro system uncontrollably. This is the same issue I had with it before and was the original reason I switched to higromite rocks. At the time I used it before however, I was not using RO water which I thought would make a difference when I switched back but it hasn't.....at all. I rinsed the rocks and let them soak thoroughly before use.....there was very little dust on them afterwards. I ran the system for two days to disinfect it and have had Rating: 5