Mr Koizumi Subarashi Bioclean

Mr Koizumi Subarashi Bioclean

Biological pond treatment for filter support, sludge reduction and water balance

Mr Koizumi Subarashi Bioclean is a premium biological pond treatment designed to improve pond hygiene, reduce maintenance requirements, and help create a healthier environment for koi and ornamental fish. Using a natural process known as competitive exclusion , BioClean introduces beneficial bacteria that help suppress harmful bacterial populations while supporting a balanced pond ecosystem. Regular use helps break down organic waste, improve water quality, reduce filter maintenance, and create conditions that lower the opportunity for disease development in fish.

Promotes a Healthier Pond Environment Subarashi BioClean helps establish a more balanced microbial population within the pond.

Biological treatments such as Mr Koizumi Subarashi Bioclean work best when the pond gives the bacteria the right conditions to establish. Use in chlorine-free water, maintain good oxygen levels and avoid dosing at the same time as strong chemical treatments unless the manufacturer says it is safe. They are especially useful after filter cleaning, new pond start-ups, medication courses, heavy feeding or seasonal waste build-up, where the biological system needs extra support.

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.

Biological support guidance

Use Mr Koizumi Subarashi Bioclean when the pond or filter needs biological support, such as after cleaning, new filter installation, medication, heavy feeding or seasonal waste build-up. Do not expect bacterial treatments to instantly remove years of sludge; they work by supporting natural breakdown over time, especially when oxygen levels and water temperature are suitable.

Key benefits

• Adds biological support for the pond or filter system
• Useful after new filter set-ups, deep cleans or medication courses
• Helps support ammonia and nitrite control as the filter matures
• Can assist with organic waste and sludge reduction depending on the formula
• Works best in well oxygenated, chlorine-free water
• A practical maintenance product for busy koi ponds and heavily fed systems

Technical information

• Brand: Mr Koizumi
• Treatment type: Beneficial bacteria and sludge control
• Product form: Liquid / pond treatment
• Target issue: ammonia and nitrite support, filter maturity, organic waste, Sludge
• Best use: Spring / Summer / Autumn
• SKU / product code: MD621
• Dosage / capacity guidance: Dosage guidance: 20g per 1,000 litres; Dosage guidance: 10g per 1,000 litres; Dosage guidance: 5g per 1,000 litres
• Important note: Use in chlorine-free, well oxygenated water for best biological activity

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 Subarashi Bioclean in a more careful and informed way.

• Use only in dechlorinated water; chlorine can reduce bacterial activity.
• Avoid dosing live bacteria at the same time as strong chemical medicines unless the label allows it.
• Maintain strong aeration so bacteria and filter media have enough oxygen.
• Allow time for biological products to work; sludge and waste will not disappear instantly.
• Reapply after medication, deep cleaning or large water changes where the label recommends it.
• Store the product as instructed and do not use if it has been damaged or contaminated.

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 GH/KH+
• Mr Koizumi Green Control
• Mr Koizumi Subarashi Detox
• Mr Koizumi – Bio Clear Flocculant
• Browse pond treatments
• Evolution Aqua Pure Pond Bomb
• Evolution Aqua Pure Sludge Bomb
• ultimate guide to koi health

Related treatment options

For similar pond treatments, compare Beneficial Bacteria & Filter Boosters, Biota Complete Filter Booster, Biota Lacto Bacterial Treatment. These links are included to help you choose the right product for the same type of pond problem, rather than as random add-ons.