Choose your fresh batch size to generate your printable feed chart. All quantities show A and B separately.
Your personalised GT Optimum feed chart
On mobile, swipe the chart left or right to see every quantity.
| Stage / each-part rate | Grow A (mL) | Grow B (mL) | Bloom A (mL) | Bloom B (mL) | Super PK (mL) | Optional silica (mL) | Finished EC (mS/cm) | pH target |
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Mixing order: Water, optional silica (follow its label and resting times), A (stir), matching B (stir), Super PK where scheduled, other selected additives, check EC, adjust pH last.
Super PK: Weeks 1–2: none; week 3: 1 mL/L; weeks 4–5: 2 mL/L; week 6: 1 mL/L; weeks 7–8: none. Mix after A+B, then check finished EC and adjust pH.
Fresh batches only: These amounts are not automatic top-up doses. For retained reservoirs, restore the water level, circulate and measure EC before any diluted, equal A+B adjustment. Do not repeat full-tank silica doses or infer silica levels from EC.
Finished-feed targets: Grow EC 1.5–2.0 mS/cm, pH 5.8–6.2; Bloom EC 2.0–2.5 mS/cm, pH 6.0–6.5. Include all additives in your final EC reading. Silica remains optional and off by default; when selected this chart uses 5 mL/L for fresh mixing, subject to the current label.
Prepared by Hunter Hydro — hunterhydro.com. Based on Growth Technology’s Optimum Grow and Bloom directions, checked 23 October 2026. Follow current labels. Keep this record with your reservoir log.