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Free shipping Over £50
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30 days return
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Secure checkout
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Over 1000 Happy Customers
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Express Delivery Available

Without using antibiotics, disinfectants, or any other kind of chemical goods, Pro-100 is an efficient preventative water treatment method.
Pro-100 will help with the natural therapeutic recovery from illness and infection, but it is not a direct cure for wounds and ulcers.
Pathogenic microorganisms that are free-living will be decreased with Pro-100.
Infected skin tissue-level bacteria cannot be reduced directly.
By absorbing the nutrients that the pathogens need to survive and grow, the colonies of helpful bacteria outcompete harmful pathogen strains.
By taking up their residence, starving them out of the food chain, and replacing the destructive bacteria with helpful bacteria, Pro-100 effectively lowers pathogen populations.
Is delivery free?
We offer free delivery on the majority of our products over £50. This excludes live fish and bespoke filters. Delivery to UK mainland addresses is £3.95 as standard, or £6.95 for express.
How do I return a product?
Get in touch via email or phone and let us know your problem, we will then help as much as possible. A postage address will be given for you to return the product back to us, and postage will be refunded where applicable to our terms and conditions, which are in line with consumer rights.
At Steel City Koi, we offer a wide range of safe and secure payment options when shopping with us.
Accepted payment methods:
Debit/Credit Cards (Inc American Express)
BACS (for faster dispatch of products) please get in touch for this
Cash upon collection *only for live fish
Pay Later options currently include Klarna and Clearpay
Safe and Secure Checkout