Hi, I'm just about to mix my own EI but donâ€™t understand something. Because this will be the first I'm going keep everything in separate bottles in the first few months to see what happens. What I don't understand is the added amount of Phosphate. James and ceg advises the concentration should be around 3ppm/week. In the dosing table Iâ€™ve found this: In 40-60 Gallons (152-227 litres) add 1/8 tsp KH2PO4 3x a week. It's 0.375 tsp/week. By using James dosing calc the result I get is 9.6ppm for a 180L tank. 152L - 11.37ppm 227L - 7.61ppm. Thatâ€™s way over the recommended concentration. Please correct me if Iâ€™m wrong or missed something. I canâ€™t really see the point of the 3x overdosing. But! Iâ€™ve seen on this forum a few days ago some1 accidentally put a tsp in the tank instead of 1/6th and the result was rapid growth. Does this mean the concentration should be even higher than the table says? And also would like to ask can I mix the salts with de-ionized water? I have about 5 litres from Halfords, it's called "Battery top-up water". Found it in the shed and want to use it but not sure if itâ€™s safe! I've seen on James site he recommends Hydrochloric Acid for the trace element mix. Do I really need it? What is that for and where can I get some? Planning to dose everything 6x a week instead of 3 (halving the amounts). I know myself I can get confused easily and donâ€™t want to mix up the days! Can this cause any problems? Meaning the phosphor-iron relationship? Or itâ€™s not an issue once theyâ€™re in the water?