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Thanks for the question. Samsung doesn't make a water filter kit for the RF221NCTASP, and this model does not have a built-in filtration system. Please call 888-BEST BUY or contact your local Best Buy team or plumber for assistance selecting a filtration kit that's available in your area. The User Manual for the RF221NCTASP, however, does provide instructions for attaching an external kit to the refrigerator's water line. - Ms. Samsung
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