powder only, i start using it as soon as all buds are set and stretch has stopped, i take a gl jug and put about 1 inch of powder on the bottom and fill the jug half full and shake the living shit out of it, us my base nutes set to 1.2 ec then add enough booster to get in to 1.4 ec., do this the rest of flower with a 10 to 12 day flush with str8 tap water.