The correct way to prepare your nutrient tank is to firstly add the finest water you can get your hands on ( reverse osmosis filters are the best and cheapest way to get pure water). Then add part A and stir very well (i use a pump to stir for me). Then part B and do the same stir very well. Adjust your EC level of the tank to the desired level.?If you use additives then now is the time to add those into the tank. Finally then check and adjust the PH to betwee 5.5 and 6.5. 6 being the optimum level to reach if possible. Also if you add to much Up or Down solution you cannot correct it. You have to dump the tank and start again. Doh !!