Type 1, Type 2 or Type 3 lab water? How to match water purity grade to HPLC, LC-MS, ICP-MS, cell culture, buffers and autoclave use — a practical guide for Indian QC labs.
Using ultrapure Type 1 water to rinse glassware wastes expensive consumables. Using RO water for HPLC mobile phases causes baseline drift, ghost peaks and shorter column life. Each application has a minimum purity requirement, and matching it controls both data quality and running cost.
Chromatography is most sensitive to organic contamination. Specify Type 1 water at 18.2 MΩ·cm with TOC below 5 ppb, produced fresh with UV photo-oxidation and dispensed through a 0.2 µm filter. Do not store ultrapure water: it picks up CO₂ and organics from containers within hours. Draw it at the point of use.
Trace-metal and ion analysis needs Type 1 water with very low ionic content (18.2 MΩ·cm). Use dedicated, acid-leached PFA or PP containers, and avoid glass, which leaches boron and sodium.
Beyond 18.2 MΩ·cm, biology applications need low endotoxin (< 0.001 EU/mL) and nuclease-free water. An ultrafilter or endotoxin-retentive final filter at the outlet achieves this.
Type 2 water (> 1 MΩ·cm, < 1 µS/cm) is enough for most buffer and reagent preparation, clinical analysers and wet chemistry. It is also the feed to a Type 1 polisher.
Type 3 (RO) water prevents scale and spotting in autoclaves, washers, humidifiers and baths at a fraction of the cost of Type 1 water.
| Application | Minimum grade | Key parameter |
|---|---|---|
| HPLC / LC-MS | Type 1 | TOC < 5 ppb |
| ICP-MS / AAS / IC | Type 1 | 18.2 MΩ·cm |
| Cell culture / PCR | Type 1 + UF | Endotoxin, nucleases |
| Buffers / reagents | Type 2 | < 1 µS/cm |
| Autoclave / glassware | Type 3 | Low hardness / TDS |
The Vivagen EXL7 series produces Type 3, Type 2 and Type 1 water from tap water in a single compact unit, so one system covers the whole lab. See all options on our laboratory water purification systems page.
You can, but once a bottle is opened it absorbs CO₂ and organics. For labs using more than a few litres a week, a point-of-use Type 1 system is usually cheaper and gives fresher, more consistent water.
High-purity laboratory water purification systems for analytical and biological applications. Type I ultra-pure water (18.2 MΩ·cm) and Type II/III purified…
Cost-effective purified water for general lab use — buffer preparation, glassware washing, autoclave feed, and routine analytical work. Compact footprint…
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