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Koi Water Barn is the #1 Japanese Koi Supplier in the UK. Offering unique Koi for sale, bespoke Koi pond design and construction as well as premium Koi foodKoi Water barn is the #1 Japanese Koi Supplier in the UK. Koi Water Barn has the widest range of beautiful, healthy koi to suit your personal taste, along side the design and construction of show-stopping residential and commercial koi ponds around the world.