Although the name and model number says "P-250A" this is more of a standard P-250 filter. The difference is that the Pentek/Pentair P-250 does NOT filter out MTBE like the Pentek/Pentair P-250A does. MTBE (Methyl Tertiary Butyl Ether) is a common gasoline additive commonly found in US municipal drinking water and groundwater as it is a common contaminant in the US.
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