4.9 is really low on the PH. When was the last time you calabrated the meter? Also when the PPMs increase it is because the plant is drinking water more than nutes, that has the PPM go up and the PH go down.
20 point move isn't bad at all, but you should try to keep the PH at 5.8 - 6.0, test and adjust daily.
If there is root excel in the UC the babies will explode soon.
20 point move isn't bad at all, but you should try to keep the PH at 5.8 - 6.0, test and adjust daily.
If there is root excel in the UC the babies will explode soon.