The first thing i would do would be to check out your ph meter.
It might need calibrating.:jointsmile:
Greenthing Reviewed by Greenthing on . ph went...down? This is something new, and another new problem for me guys; it's that time again :thumbsup: OK, in the three years doing this not once has my ph in my res DROPPED. What could it be? What's new?? I've been adding CAL-MAX (like calmag plus) I added it last Saturday and changed my res Wednesday. The ph didn't go down on Wednesday from the previous adding on Saturday. Rating: 5