Runoff EC higher than feeding EC

I agree with Chow_13 - your pH is much too high for coco.. follow his advice, flush it with as much 5.8 water until the runoff is 5.8 and then feed. I'm assuming this is your mimosa auto? You can start adding bloom nutes about now, if it is, as she will soon be needing them. And remember, with autos, less is more so don't go full strength on any nutes unless she seems to NEED more... Good luck!

adding: I keep my PH between 5.8-6.4 in coco ! I dont see a big problem in the ph beeing 6.6 now for once but in the future u want to get it down to those values so keep an eye on it the next feeding !

Its normal in coco if you want the runoff to be the same value you just have to feed more so you get more runoff and push excess salts out but its not necessary ! but you feed very light anyways so there is nothing to worry about ! I have my ec at 3.0-2.0 in vege and also flower untill i flush so if the runoff is in that frame I Don't see any problems ! in vege i aim more towards 3.0 ec and in flower i lower it towards 2 over time ✌️🏻💚💨 feed them virgins hard so they get frosty plantpussies which we consume for the joy or pain brothaaa 😁🤣