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KH & GH dosage calculator

Quickly calculate the right amount of KH+ and GH+ for your pond.


1. Your current GH value

2. Advice and desired GH value

The ideal GH value is between 8° and 12°. Rule of thumb: GH ≈ 1.2 × KH.

Recommended for your pond:

3. Volume of your pond

4. Required amount of GH+ Control

Dosage: 100 grams/m³ raises the GH by 3–4°.

Enter your current GH, desired GH and pond volume to calculate the dosage.
Your GH value is already at or above the desired level — no dosing needed.

You need to add: of GH+ Control to raise your GH by .

Do not raise the GH all at once: max. 1–2° per 24 hours. Spread this dosage over at least (approx. per day).

1. Your current KH value

2. Advice and desired KH value

A sufficiently high KH value (between 6° and 11°) is important: it stabilises the pH and protects against a sudden pH crash.

Recommended for your pond:

3. Volume of your pond

4. Required amount of KH+

Dosage: 100 grams/m³ raises the KH by 3–4°.

Enter your current KH, desired KH and pond volume to calculate the dosage.
Your KH value is already at or above the desired level — no dosing needed.

You need to add: of KH+ to raise your KH by .

Do not raise the KH all at once: max. 1–2° per 24 hours. Spread this dosage over at least (approx. per day).

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