my ph meter is only a few months old and i do calibrate it regular. like i say its only been recently that this has been happening, thats why im finding this so strange. i have to raise it daily. if i put it right to 5.8-6ph in the morning by the end of the day its at 5.2.
For at least 8 years up untill recently i would set my ph at 5.8 and it would raise to 6.2 and i would lower again to 5.8 and it would go up again not down. i allways thought this was right for your ph to go up.
Its like i have been doing something for a long time and now i have to do the opposite of what i have been doing for all them years.

I also read something saying if your ph is going down and not up there is a problem in your root zone. i do clean in between grows.

ITS SERIOUSLY BUGGING ME COS I CANT UNDERSTAND WHY!!!!!!!!!!!