Irrespective of what type of water is being conveyed all pipework and fittings should be marked in accordance with BS 1710. Further information can be found here.
Any water fitting conveying any fluid other than mains supplied water should not be directly connected to a plumbing system supplying mains drinking water
With the agreement of the local water undertaker a mains water back-up to an alternative water source system may be permitted subject to the installation of appropriate backflow protection.
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