Feed Water Water (check the drain) Water/or/Feed (depending on the last drain). You’re feeding to often , nutrients start to crystalize and turn into NaCl (salt) creating an hypertonic condition in the media and pH start to drop, the plant has to reverse the flow of her fluids (water) to turn the media back into an isotonic condition but she won’t be able to balance the pH .... you must give a good flush asap before serious problems start to appear !