you could buy a cheap sump pupmp to drain them with... running a hose to your tub... as for filling . just keep and extra tub to mix new res water in and pump it back... because if you wanna Do DWC the bigger the roots the bigger the buds right.
OutaBud Reviewed by OutaBud on . Dwc System In two 30 gal Tubs Hey everyone. I am new to this. I am setting up a dwc system using two 30 gallon tubs. I hope to have 6 plants in each one. I am running 3 6" airstones with each system. I have done some reading but i am coming back to the same problem. How will i ever be able to drain these huge tubs and refill them with already ph'd water. Somebody please help! I will be using a 600w hps and the room im using is a walk in closet 8' by 4' with 8 ft ceilings. Any help is welcome. Rating: 5