Whatman Polycap GW (Ground Water) capsule filters from Cytiva are specifically designed for sample preparation of ground water samples for dissolved metals analysis. The in-line design with stepped hose barbs and hydrophilic polyethersulfone (PES) membrane make it easy to use for field sampling.

• Stepped hose barb fittings allow for connection directly to outlet of a sampling pump with various size tubing
• Effective filtration surface area of 600 cm² to ensure rapid sample collection
• PES filters in thermally fused housing eliminate sample contamination that could come from glues, adhesives, metals, epoxies, or extraneous materials
• Lot number printed on each unit for traceability supports use in regulated field sampling methods such as EPA Method 3005 for ground water analysis
• Well suited for ground water sampling as a dissolved metals filter