If your circulating with a pump for a drip or what not it could be your pump throwing your ph off,
Turttle Reviewed by Turttle on . PH dropping I've just come off fixing my ph from swinging WAY too high in a short time (it was not normal ph drift). I replaced the water and flushed, things seemed good until a few days later. Now my ph is slowly drifting down from 6 to 5.5 in the course of half a day. The plants are getting worse. It started out as ph spotting, but grew into mg, cal, or phosphorus deficiency (I strongly believe it is the mg that is locked out and they are also a little K deficient in parts, yellowing has occured as Rating: 5