We have resently added hygrozyme to the mix and when the plants are young the PH is stable. Seems as the root system is larger the PH wants to drive way down into the 4's. Don't know why but the more the tubs are topped up the more stable it gets. We had root problems and not the PH problem before. I guess that's why they make up and down.

If you don't see or smell problems with your roots you most likely don't have problems.

Have you added anything new ?