Dutch Master Reverse from 4 hydroponics.com by Growco Indoor Garden Supply

You will want to use the Penetrator along with it...the reverse itself you use full strength but the Penetrator you only add a little so it lasts forever.

Follow the directions carefully (apply on day 1 and day 10 0f flower) and you will have no herms (unless you really screw with plant and the light etc....) This stuff works GREAT!