NILPA KH+ dose

How much KH+ to add to replacement water or a batch — per NILPA instructions (5 mL / 40 L per +1° KH).

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

KH — more stable than pH; test before a water change or 15–30 min after mixing.
KH buffers pH; sudden KH shifts are riskier than gradual ones — avoid forced hardness swings.

Tank volume, L

KH_tank

Current tank KH, °dKH

Change volume, L

KH_src

Replacement KH before KH+, °dKH

KH_goal

Target KH after change, °dKH

KH+ dose

6.50 мл

Replacement KH: 13,00 °dKH

KH_repl = (T·KH_goal − (T − W)·KH_tank) / W

мл KH+ = W·(KH_repl − KH_src) / 8

NILPA: 5 mL / 40 L per Δ 1° ⇒ mL = V·Δ/8. No more than 2–2.5° KH per 12 h. KH+ instructions