Sargent-Welch QuantitativePorosity: CoarseFlow Rate: FastParticle Retention: 15μmApplications: Suitable for use with silica, iron and aluminum hydroxidesVWR Brand Grade #494Porosity: Fine - AshlessFlow Rate: SlowParticle Retention: 1μmApplications: Useful for very fine precipitates. Ideal for BaSO4, PbSO4, SnS2, NiS, CaOH2VWR Brand Grade #474Porosity: Medium - AshlessFlow Rate: MediumParticle Retention: 5 - 10μmApplications: For general quantitative analysis. Ideal for the filtration of AlPO4, ZnNH4PO4, Ag2CrO4