Hydro A is a high quality fertilizer that must be used in combination with Hydro B. Hydro A and B together contain all the nutrients necessary for early growth and flowering in any medium. When using 2 mixing tanks, mix Hydro A in tank A, when using 1 mixing tank, mix Hydro A and Hydro B together in sufficient water. Do not leave the water prepared. Preferably use water at room temperature. Water every day as needed. Be careful not to overdose.