I just dumped the containers and rinsed in very hot water then put in plain ph'd water for the last 2 weeks. But the WW took longer than the NL X Shiva and by the time I realized she needed to go longer, I didn't want to put more nutes in. She actually was in plain water for the last 3-4 weeks before harvest. I worried alot about that. Didn't know what to do but I think she might have liked it. Turned out very well.