yes i see the cal mag i bought from greenleaf has nitrogen in it . i will try and order similar products to yourself , hopefully with the same ratios. i understand if i can't get the same ratios it will skew the excel sheet . i will let you know how i get on . thank you for your help @Mañ'O'GreenNo not really by itself read the post about nutrients until you understand it. Most calmags are just calcium nitrate too much nitrogen!