Cannazym - 10L | Liquid Plant Nutrients

this is the one I use but I think rhizome sort of figures they are all the same...sensizyem etc

You were a good man to flush your medium, good work there. I think all you need to do....is trade in that last gallon of tap water for RO and add some CalMag and a zyme product to help with the dead roots. I feel the Calmag is NECESSARY (and would like to see all RO water so we know EXACTLY whats going in your rez) and the zyme is always a good idea.....but not so necessary.