NILPA GH+ dose

How much GH+ to add to replacement water or a batch — per NILPA instructions (5 mL / 20 L per +2.5° GH).

For comparable readings over time and with this calculator, keep conditions consistent:

GH — like KH; for water changes, measure tap/replacement water and tank separately.
Replacement GH and tank GH are different; test tap or bucket water separately.

Tank volume, L

GH_tank

Current tank GH, °dGH

Change volume, L

GH_src

Replacement GH before GH+, °dGH

GH_goal

Target GH after change, °dGH

GH+ dose

5.60 мл

Replacement GH: 15,00 °dGH

GH_repl = (T·GH_goal − (T − W)·GH_tank) / W

мл GH+ = W·(GH_repl − GH_src) / 10

NILPA: 5 mL / 20 L per Δ 2.5° ⇒ mL = V·Δ/10. Volumes and GH use 0.5 steps.