Selenium will not give you as much increase as you want. Chromium INtensifier will add to your grain and is very toxic to the environment.
It is chromium (VI) that is very toxic. Mixing the used bleach with sodium sulfite will reduce the chromium to chromium (II) which is an essential trace element. Add sodium sulfite until the orange color changes to green.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.