The Short Version

Plants can only eat what their roots can absorb, and that depends on pH. In hydroponics the sweet spot is 5.5–6.5. Outside it, nutrients lock out and leaves go pale even in a full tank.

How to Manage It

  • Test weekly with drops or a meter.
  • Adjust with pH "up" (to raise) or "down" (to lower).
  • Add it to the reservoir, not to the concentrated A/B.

Frequently Asked Questions

Q: My nutrient says complete -- why pale leaves?

A:

Almost always pH. Test before you add more food.

Q: Do I adjust A and B separately?

A:

No -- dilute each, then adjust the mixed solution.

Q: How often?

A:

Weekly; pH drifts as plants eat.

pH is the quiet secret of hydroponic success. Log it in the care schedule tool.