Is it recommended that the flood level touches the bottom of the rockwool (1" cube inside hydroton) each time I flood? throughout the entire grow.

Also, how do I test the runoff PH? not the reservoir. Ebb and Flow system
Illusion Reviewed by Illusion on . flood level and rockwool Is it recommended that the flood level touches the bottom of the rockwool (1" cube inside hydroton) each time I flood? throughout the entire grow. Also, how do I test the runoff PH? not the reservoir. Ebb and Flow system Rating: 5