Provides an efficient method of preparing subsamples of collected water-sediment mixtures from stream flows for water quality analysis. Water sediment samples are poured into the sample splitter where they are composited into one representative cross section sample of the stream flow. This composite can now be split into the required four to sixteen representative subsamples. The polyethylene sample splitter consists of a thick walled cylindrical vessel with a disc churn. A center handle extends through the cover and a locating notch keeps it oriented in one direction. A small polypropylene spring-loaded spigot drains the subsamples into bottles for delivery to the water quality laboratory. A carrying handle makes carrying the full or empty vessel easy. Intended to meet USGS water sampling protocol. Lid and spigot are replaceable. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Bel-Art and H-B Instrument brand laboratory supplies include over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons. Custom calibration services, plastic molding, specialty coatings and wire manufacturing are also available. Wilmad-LabGlass brand laboratory glassware complements Bel-Art and H-B Instrument with over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. SP Scienceware is a division of Warminster, PA based SP Industries which also include SP Scientific laboratory, thermal management, and pharmaceutical production equipment and SP Ableware aids for daily living.