Two-pack. For crystal clear water with convenient, trouble-free maintenance. Activated carbon removes harmful gases and odors. Clears up unsightly discoloration. Disposable cartridges fit lift tubes of Penn-Plax Multi-Pore and Undergravel “E” Filters. For crystal clear water with convenient, trouble-free maintenance.Activated carbon removes harmful gases and odors. Clears up unsightly discoloration.Disposable cartridges fit lift tubes of Penn-Plax Multi-Pore and Undergravel “E” Filters.. fish tank filter gravel
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