Wait, sometimes it takes a little while for the Ph to adjust. And do it slow, plants don't like Ph changes that are drastic. That's if the plants are already using that water. I usually wait for at least two hours, before adding more.ok i have a 5 gal rez and i mixed my flroa nova nutrients with 4 drops of superthrive .. and put 15 drops of ph down and it still says on my meter 6.7!!
i recaliborated my meter and Tested again .... still 6.7 wtf? do i do?/should i continue to add more and more ph down?