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I guess that my questions should have stated that if I measure a current PH of 8.5 (which I never have) after a few days and the plant need 6.5, would the buffer make up the difference and provide the nutrients to be available to the plants at 6.5 even though my tester states that the PH is much higher?
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No, the pH buffers wont change the pH. You will still need the pH adjusters (down) to get the 8.5 pH into the desired 6.5 pH range. The buffers just help keep it in the 6.5 pH range longer (after using the pH adjusters to get it there).