H
heisen
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4 inch cylinder stones.they work well.just boil them between each grow to keep them clean and flowingGreat tutorial HB! Thats a well thought out system. I'm almost ready to make a UC system and actually was close to DMing you for plans on this system not long ago lol so I'm glad you posted this thread, thanks!
one question, what kind of airstones do you use? and what size?