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Athena Classic BioStone Plus Filter
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The BioStone Plus starts with the same compressed carbon block then adds "Plus Technology" by impregnating it with specialty media to increase contaminant reduction. It removes more than the Basic including chloramine, heavy metals and other tough contaminants. Containing Scale Guard protection, it will outperform any GAC filter - regardless of micron rating.
Use - Filter 2 position for the Athena Classic.