No side by side for air stones, here's modified WFs w/o air stones..
Mixed Hydro - Water Culture - Coco/Perlite
I'm running two Nirvana Supreme CBD Kush, in 75%coco/25% perlite... In the waterfarms L>R, Blackberry x2, and one Blue Mystic.... The only nutrient used throughout grow will be GH Floranova Bloom.... Haven't used any other fertilizer for years.... It's definitely a lazy mans fertilizer...
www.420magazine.com