The 4.5 x 10" carbon pre-filter is the correct replacement filter for the old school R5 Systems._x000D_

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These carbon block filters are made using 100% coconut shell carbon, a renewable and ecologically sustainable material._x000D_

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-5 Micron nominal filtration_x000D_

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-Exceptionally low pressure drop_x000D_

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-High dirt holding capacity_x000D_

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-Extremely economical