KH Plus 250 ml — Liquid Alkalinity Booster for Reef Aquariums - Aquaforest

Aquaforest KH Plus 250 ml — fast liquid alkalinity solution for reef tanks

The KH Plus 250 ml is Aquaforest's standard liquid alkalinity (dKH) solution. Formulated from soluble alkaline salts, it quickly lifts KH on a reef tank without introducing competing calcium or magnesium. Used to correct a fast alkalinity drop, dose daily on a Ca+ / KH+ / Mg+ managed tank, or complement a light Balling regimen.

The 250 ml format fits nano reefs and tanks up to 200 L with moderate consumption. Aquaforest specifies that correction speed must never exceed 0.5 dKH per 24 h — alkalinity stability outranks speed.

When to use KH Plus

• Fast KH drop — gradual return to the 7-9 dKH (SPS) or 8-11 dKH (LPS) target.
• Add-on to separate Ca dosing — Ca+ / KH+ / Mg+ / Reef Mineral Salt method.
• Nano reef where full Balling is overkill.
• Water-change-managed tank — top-up between changes.

Aquaforest official dosing

• Starting dose: 5 ml per 27 US gal (100 L) of tank water per day.
• Measurable effect: 10 ml in 100 L raises alkalinity by about 0.5 dKH.
• Maximum dose: 10 ml per 100 L per day.
• Maximum rate: never raise dKH by more than 0.5 in 24 h.
• Add zone: in a high-flow area to prevent local precipitation with calcium ions.

Specifications

• Brand: Aquaforest (Poland)
• Format: 250 ml bottle
• Type: standard liquid alkalinity (dKH) solution
• Compatibility: nano and small-to-mid reef tanks, top-ups on any format

Why choose Aquaforest at ReefSolution

• Lab KH Plus 2 L — the concentrated large-format version for established tanks with sustained consumption.
• Ca Plus 250 ml — the calcium to dose alongside for KH-Ca stability.
• Alkalinity Test Pro — the essential KH test to fine-tune the dose.

Frequently asked questions

Why not exceed 0.5 dKH per 24 h?

Too fast an alkalinity lift destabilizes the tank's carbonate-calcium balance, with risk of abiotic calcium carbonate precipitation — water turns cloudy, parameters become unstable, and corals suffer osmotic stress. Aquaforest recommends patience: several days of gradual lift beat a single spike.

Can I dose KH Plus at the same time as Ca Plus?

Yes, but never at the same dosing point or at the same time — direct contact between the two concentrated solutions triggers immediate calcium carbonate precipitation. Space at least 15-30 minutes apart and dose in two opposite zones of the tank.

How long does a 250 ml bottle last on a 100 L tank?

At the 5 ml/day starting dose, the 250 ml bottle covers 50 days (about 1.7 months). At the 10 ml/day max, duration drops to 25 days.