Mr Koizumi – Filter Start Treatment

Mr Koizumi – Filter Start (1L & 5L)
Premium pond filter bacteria | Rapid biological filtration boost | High concentration formula

Mr Koizumi Filter Start is a professional-grade pond filter bacteria treatment designed to kick-start and maintain strong biological filtration in ponds, koi systems, and water gardens. Formulated with a precise mix of live Nitrosomonas and Nitrobacter bacteria, this concentrated formula rapidly breaks down harmful ammonia and nitrite, helping to create crystal-clear, healthy water conditions for your fish.

Whether you choose the convenient 1-litre size or the larger 5-litre value bottle, both variants deliver the same advanced formula trusted by pond keepers and professionals. Filter Start remains active even in cooler temperatures (from 8°C), making it ideal for use all year round — during pond startup, after maintenance, or following the use of medications.

Explore more products from our water conditioner collection to support a balanced and healthy pond ecosystem.

Key features and benefits

• High-concentration formula: Contains around 1 billion CFU (colony-forming units) per ml, making it one of the most concentrated and effective pond filter starters available.

• Boosts biological filtration: Rapidly establishes a thriving nitrifying bacteria colony, efficiently converting ammonia into nitrite and then nitrate.

• Improves water quality: Actively removes ammonia, nitrite, and excess organic waste, reducing fish stress and preventing water toxicity.

• Effective in cooler conditions: Works from temperatures as low as 8°C, perfect for spring start-ups and year-round maintenance.

• Prevents filter clogging: Helps break down organic debris and sludge, improving flow and filter efficiency.

• Safe and natural: 100% natural, non-toxic, and completely safe for koi, goldfish, and all pond wildlife.

How to use

1. Shake well before use.

2. Add directly into your pond filter or evenly distribute across the pond surface.

3. Ideal for:

   • New pond and filter setups

   • After water changes or filter cleaning

   • Following pond treatments or medications

   • Regular maintenance to stabilise pond biology

Dosage: Refer to the label for recommended dosage based on pond volume. For larger systems, the 5L variant offers excellent value and long-term coverage.

Why choose Mr Koizumi Filter Start

Trusted by pond professionals and enthusiasts alike, Mr Koizumi Filter Start is engineered to deliver fast and reliable biological support that keeps your pond balanced and water crystal clear. Its ultra-concentrated bacterial blend promotes stable filtration, reduced sludge, and optimal water quality — essential for healthy, thriving fish.

Both the 1L and 5L sizes offer the same premium-grade formulation, giving you flexibility depending on the size of your pond or maintenance routine.

If you’re serious about long-term water clarity and biological health, Mr Koizumi Filter Start is the perfect partner for any koi pond or garden pond system.