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Thanks for the question. Turning off the water supply line to replace the filter is not a requirement, but doing so may help to alleviate pressure in the lines if you find it difficult to remove the old cartridge or insert a new one. - Ms. Samsung
Sorry, there was a problem. Please try again later.I tried changing the water filter without turning off the water line. It seems to work. You do not need to turn off your waterline to change the filter.
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