Hashyanswered grow question 3 years ago I usually stabilise the ph with the fush and depending on the Ec reading on the last bit of run off determine what I do. If my Ec for feeding was at Ec 1.2 and after I flushed the Ec was 0.4 in the last part off the run off from the flush then I would feed. But if my last flush run off was Ec of 1.0 I would leave it as is and feed when they need watering again.