The Whatman Polydisc GW (Groundwater) inline filter is specifically designed for preparing groundwater samples for dissolved metals analysis. Hydrophilic, durable nylon membrane is compatible with aqueous samples 100% quartz fiber pre-filter with low heavy metal content enables filtration of larger volumes of even highly particle-laden samples Certified low background metal levels for heavy metal testing Large filter area of 20.4 cm² Hose nozzle compatible with 6-14 mm inner diameter hoses You can find the certificate here if applicable: https://www.cytivalifesciences.com/en/de/support/quality/certificatesMeer tonenMinder tonen