The DWC system I got has a automated system for empty and fill of your res. I turn a valve on a attached hose and then turn on the watering manifold pump The hose makes emptying easy!. Goes in a small 5 gal bucket on a floor dolly for disposal. I poor the wast water on our cactuses!. After my grow is done, the same system helps out with clean up as well. I plan on cleaning my tent and gear with 1 part Peroxide mixed with 6 parts water. I just mix all in my EMPTY RES. then turn on the pumps!. The disinfecting fluid is pumped throughout the whole system. Then, I will use the REMAINING pre mix disinfectant in the res. and a sponge for tent walls. A CLEAN GROW IS A HAPPY ONE.