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Replacement membrane kit for the CLF10sc free chlorine sensor. It is recommended that membranes are changed at least annually, or more frequently depending on water quality.

- See more at: http://www.hach.com/membrane-replacement-kit-for-clf10sc/product?id=7640300529&callback=qs#sthash.FHPXN8Yn.dpufPanel Dimensions: x x