My self purchased a 4 bucket drip hydro system. In the reservoir I have 40 liters of water and have been using advanced nutrients 2 part veg formula with VitaMaxplus added also. I have to check the ph and PPM a couple of times a day as lost 2 plants at the beginning because by the end of week water getting to toxic. With the PPm meter am able to keep it stable and know when to add food or water. I change the water reservoir once a week and when doing this just have water for the first day to flush any salt build out. THE BEST INVESTMENT WAS THE ppm Meter.

Below Pics after week 4 weeks veg and have done one topping and took my next geration off.