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15. After regulation 5 of the 2006 Regulations, insert—
5A. Where a relevant person disinfects a private water supply for human consumption purposes, the relevant person must—
(a)where necessary, subject the water to sufficient preliminary treatment to prepare the water for disinfection; and
(b)design, operate and maintain the disinfection process so as to keep disinfection by-products as low as possible without compromising the performance of the disinfection process.”.