DNF Green can be used in the Bloom stage if yellowing occurs at a rate of 

 2 tsp/Gal. For use with soil or soil less mix apply at full strength every third feeding.

DNF Black may be used weekly in the hydroponics reservoir in soil or soil less media to help maximize nutrient efficacy. It is compatible with most rooting hormones and hydroponics nutrients. Use at a rate of 2 ml/liter in hydroponics. Use at a rate of 3ml/lit re in soil less mix and apply weekly.

DNF Clear may be used between reservoir changes to aid in nutrient uptake during the entire growth cycle.

DNF Black, DNF Gold, DNF Green and DNF Clear are best used in conjunction with your favourite fertilizer such as DNF Hydro-Organic or Dutch Nutrient Formula.