Artful Intelligence. Compared to conventional Estimative Index fertilisers:2X more nitrate limiting for richer colours*2X more magnesium for stronger growth^ Dose 2ml per 100L daily Our Standard 300ml Pack comes with a calibrated pump. 1ml per press.Lasts ~3mths for a 40 Gal / 150L tank. why+ ingredients- GUARANTEED ANALYSISTotal Nitrogen (N)........................................... 2.0%2.0% Nitrate NitrogenAvailable Phosphoric Acid (P2O5)....................1.37%Soluble Potash (K2O)....................................... 8.0%Magnesium (Mg)............................................. 1.60%Iron (Fe) ...........................................................0.16%0.16% Chelated IronDerived from: Potassium Sulphate, PotassiumPhosphate, Potassium Chloride, MagnesiumNitrate, Magnesium Sulphate, DTPA Iron, EDTA Iron, EDDHA Iron Further information here