Nulife Poweractive is a crop specific culture of beneficial bacteria. It works by by giving increased growth when asssociated with the roots of the crop. Thses bacteria have been specifically designed with hydroponics in mind. Use 1ml to every litre of nutrient solution and repeat every 3 weeks or when tank is changed. Combining Power Active with Stop wilt will give the best possible conditions for bio-active rhizosphere and protection from root disease.