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21in Filter Insert (EMPTY)

21in Filter Insert (EMPTY)

Regular price $46.77
Regular price Sale price $46.77
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Looking for a refillable filter cartridge for 4x21" housings? This is it. These refillable cartridges fit the 4x21" housings from many different manufacturers. Fill with our virgin bulk DI resin to save big on your filter cost. Holds 1/10 of a cubic foot of DI resin.
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