Flush the rez, and rinse it out ok, lol, then fill it bac up with plain water, pH'd adjusted, and let her chill for a 2 day or so, then, when you start bac up, add the nutes at 1/4 strength, dont follow those charts, their just a basic guide line to follow, people usually make their own schedule, then every week just slowly bring it up higher and higher, and then you can look at those charts and adjust it a lil bit into what your doing, stains are always different, some can take a shit load, and some not that much, you will kno whats good after a couple weeks, you'll get the feel to it, its all about experimenting, but starting it slow at fist