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nuvoH20 cartridge housings are NSF certified and all nuvoH20 scale control cartridges are NSF certified for general purpose scale control.
Std. 42 Housing model numbers: S2075[Pb], WH2100 [Pb]. Std. 169 Cartridge model numbers HPS2516C, HPWH2516C, HPWH42516C, Hscrubber, Mscrubber, S2416C, Sscrubber, WH2416C, WH42416C.