YOU USE THE DRIP FOR THE ROOTS TO HIT THE WATER!!!!THE WATER HITTING THE SUFACE CREATES D.O...YOU DONT EVEN NEED AIRSTONES W/ A DRIP...THE PLANTS IN MY DRIP GREW 3 TIMES AS FAST AS THE ONES IN REG DWC...DONT LISTEN TO PEOPLE WHO DONT KNOW WHAT THERE TALKING ABOUT