I use flood and drain as well and the only noise I get is the water draining back into the res once the tray with the plants gets full. The pump itself is pretty much silent.
dejayou30 Reviewed by dejayou30 on . How Loud? I always have done soild grows in my closet and plan on switching over to hydro.... Only concerns are, -how much noise do aeroponic misters create? Enough to noticable hear it from outside the sealed closet? -Will aeroponics require a loud noisy pump? -How loud will a DWC bucket be? Rating: 5