Mr Koizumi GH/KH+

Mr Koizumi GH/KH+

Mineral, clay or buffer treatment for stable pond water and koi support

Mr Koizumi GH/KH+ is a premium mineral balancing treatment designed to maintain the correct General Hardness (GH) and Carbonate Hardness (KH) levels in ponds. Formulated with a broad range of essential natural minerals, this treatment helps create a stable aquatic environment that supports fish health, aquatic plants, beneficial microorganisms, and biological filtration. Maintaining proper GH and KH levels is essential for preventing pH instability and acidification while ensuring optimal conditions for healthy pond life.

Maintains Essential Mineral Balance GH/KH+ replenishes vital minerals required by all living organisms within the pond ecosystem.

Mineral, clay and buffer products are used to support water stability rather than to mask a deeper water quality problem. Products such as Mr Koizumi GH/KH+ are most useful when KH, GH, pH, mineral content or suspended fines need attention. Testing first is important, because very soft water, low KH or unstable pH can affect fish health, filter bacteria and the way other treatments behave in the pond.

Mr Koizumi Subarashi products focus on biological pond improvement, water detoxification and fish-safe pond support. Subarashi Detox is used for ammonia, nitrite, chlorine, chloramine, heavy metals and acid rain contaminants in stressed or immature systems.

Water balance guidance

Use Mr Koizumi GH/KH+ with an understanding of your pond’s KH, GH and pH stability where relevant. Mineral and buffer products can be very useful, but sudden changes should be avoided. If the pond is very soft, heavily stocked or exposed to heavy rain dilution, regular testing gives a safer picture than occasional guesswork.

Key benefits

• Supports more stable pond water chemistry
• Useful where KH, GH, minerals or suspended fines need attention
• Can help support koi condition, skin quality or water clarity depending on the product
• Works well as part of a measured maintenance routine
• Testing first helps avoid unnecessary or incorrect dosing
• Useful in soft water areas or ponds affected by heavy rain and dilution

Technical information

• Brand: Mr Koizumi
• Treatment type: KH, Mineral, pH and water balance
• Product form: Liquid / pond treatment
• Target issue: GH, KH, mineral balance and water hardness, pH stability
• Best use: Year round
• Dosage / capacity guidance: Dosage guidance: 100g per 1,000 litres

How to use safely

The product label should always take priority over general guidance. The points below are included to help customers use Mr Koizumi GH/KH+ in a more careful and informed way.

• Test KH, GH or pH where relevant before dosing.
• Add gradually if the label recommends staged dosing rather than one large correction.
• Keep strong aeration when using powdered treatments that temporarily cloud the water.
• Do not use mineral products as a substitute for correcting underlying water quality issues.
• Check compatibility if using alongside medicines or blanketweed treatments.
• Allow filters and skimmers to clear fine particles after application.

Helpful related products and advice

Use these links to compare similar products in the same range or choose supporting testing, purifier or maintenance products where relevant.

• Mr Koizumi Clay 86
• Mr Koizumi Green Control
• Mr Koizumi Subarashi Bioclean
• Mr Koizumi Subarashi Detox
• Mr Koizumi – Bio Clear Flocculant
• Browse pond treatments
• ultimate guide to koi health
• pH levels in ponds guide
• water hardness and pH stability guide

Related treatment options

For similar pond treatments, compare pH, KH & Mineral Treatments, NT Labs GH- Minerals Up, NT Labs KH – Buffer Up. These links are included to help you choose the right product for the same type of pond problem, rather than as random add-ons.