VWR® Ultrapure Water Systems produce laboratory-grade purified water (ASTM Type I, II, and III / ISO 3696 Grade 1, 2, and 3) on demand using a multi-stage purification process combining reverse osmosis (RO), ion exchange resin, activated carbon, UV sterilisation, and ultrafiltration (UF) membranes. Consistently delivers water with resistivity ≥18.2 MΩ·cm, TOC <5 ppb, and bacterial counts <0.1 CFU/mL. Features include: real-time water quality monitoring with digital display (conductivity and resistivity), automatic RO pre-treatment, modular cartridge system for easy maintenance, and a dispenser for direct filling of vessels. Suitable for HPLC mobile phase preparation, DNA/RNA work, cell culture, reagent preparation, and analytical instrument rinsing. Eliminates the cost and logistics of bottled water.