Hi all, Wanted to run some things by you as I am a bit confused. I just ordered my dry salts and am going to give EI a go. Looking on James' page it states you should dose to achieve the following: Nitrate 20â€“30ppm, Phosphate 1-3ppm, Potassium 20-30ppm. But then on the Dosing Calculator page it states: 8ppm of Nitrate(KNO3) which is added 3x a week and 2ppm of Phosphate(KH2PO4) which is added 3x a week. Ok, so here's my confusion. If you take 8ppm KNO3 (x3) times a week reaching a total of 24ppm for the week, this would be within the 20-30ppm stated. But then the 2ppm dosing of KH2PO4 (x3) times a week would put you at 6ppm which is double the highest level stated. What am I missing? Am I doing something wrong? :? And as far as Potassium is concerned, if I use the calculator to find the proper amounts of salts to add to get 8ppm KNO3, and 2ppm KH2PO4. I get 5.06ppm Potassium from KNO3 and .82ppm Potassium from KH2PO4. Multiply by 3 times a week and you get 17.64ppm. Just a bit lower that the 20-30ppm. Maybe you could shed some light on this for me. Not sure if I am misunderstanding the calculations or am missing the whole concept of 'Estimative' Index. If you want to use the calculator to check my findings. I have a 39 US gallon tank and will be dosing dry. So I am looking for gram weights. What I came up with is this: .42 grams KH2PO4 = 1.99ppm Phosphate and .82ppm Potassium (if 2ppm is correct level) 1.93 grams KNO3 = 8.01ppm Nitrate and 5.06 ppm Potassium I just want to know what parameters I am shooting for so that I can do this properly (with all the help I can get). My plants and fish thank you.