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Amazon.com: (1 Pack) Calcium, Magnesium TDS Hardness Reduction Water Softening 20" x 4.5" Cation Resin Filter Compatible with 20" BB Whole House Water Filter Systems : Tools & Home Improvement
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2 Pack) Calcium, Magnesium TDS Hardness Reduction Water Softening Cation Resin Filters compatible with 10" Standard Whole House Water Filter Systems - Amazon.com