GMSgrowsanswered grow question 3 years ago Feeding schedule for autos in water grows. Start at 200 ppm, 0.4 ec for their first week. If you are seeing good growth by the end of that week then increase by 100 ppm, 0.2 ec. Autos usually max out around 600ppm 1.2 ec to 650 ppm, 1.3 ec. Your water should be prepared 24 hours before hand to help to settle the natural ph rise in the water. A bubbler can help it reach its max ph a little faster. Then you add your nutrients, ph the solution and your good to go. It is also best to keep it as close to 5.8 through your veg as possible. 6 to 7 is for soil grows, 5.5 to 6.5 is water grows. 5.5 to 6.0 in veg and 6.2 to 6.3 in flower is where they like to be. After you feed if ph rises to fast add a little more nutrients, if it lowers to fast then less nutrients. When the ph stays pretty steady is what we call having dialed it in.