Specification builder · Tier B
Laboratory water purification system producing Type II/III pure water (RO/EDI) and Type I ultrapure water (18.2 MOhm.cm) with feed-water pretreatment and storage
A laboratory water purification system turns tap water into pure water (Type II/III, by reverse osmosis plus EDI or ion exchange) and ultrapure Type I water (18.2 MOhm.cm, very low TOC) for HPLC, Karl Fischer, ICP/AAS, clinical analysers and molecular biology. It is bought by pharma QC labs, drug testing labs, hospital clinical labs, universities and research institutes. In Pakistan the quality of local feed water and the yearly cost of proprietary cartridges matter as much as the purchase price.
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Standards this specification draws on
- ISO 3696 Defines Grade 1, 2 and 3 water for analytical laboratory use (conductivity, oxidisable matter, silica).
- ASTM D1193 Defines Type I to IV reagent water (resistivity, TOC, sodium, chloride, silica) used in most lab water tenders.
- CLSI GP40 Defines clinical laboratory reagent water (CLRW) and how to verify it for clinical analysers.
- USP <1231> Pharmacopoeial guidance on water for pharmaceutical purposes, including purified water used in QC testing.
- USP <643> Total organic carbon test and TOC instrument system suitability; applies to on-line TOC monitors.
- USP <645> Water conductivity test with temperature-compensation rules; applies to the system's conductivity/resistivity measurement.
- IEC 61010-1 Basic electrical safety standard for laboratory equipment.
- IEC 61326-1 Electromagnetic compatibility (EMC) requirements for laboratory electrical equipment.
- ISO 9001 Quality management system of the manufacturer.
- ISO/IEC 17025:2017 Accreditation standard for testing labs; requires suitable, calibrated equipment including reagent water quality records.
Common mistakes in tenders for this equipment
- Specifying only '18.2 MOhm.cm Type I water'. Resistivity shows ions only; also state TOC, bacteria and, where needed, endotoxin limits and how they are verified.
- Copying one brand's exact figures or technology (a particular UV wavelength, dispenser design, tank type, production steps such as 3/5/10/15 L/h) so only that model qualifies; state minimum performance with 'not less than / not more than'.
- Ignoring local feed water. Hard, salty, chlorinated or silty Pakistani supply destroys RO membranes and EDI modules; require a site feed-water analysis and a pretreatment train designed from it.
- Judging bids on purchase price only. Proprietary cartridges, UV lamps and filters can cost more than the system over 5 years; ask for a fixed 5-year consumable price list and add it to the evaluation.
- Under-sizing production and storage for clinical analysers, dissolution baths and glassware washers, or forgetting that RO output falls in cold winter water.
- Buying no first-year consumables, so a new system stops when the first cartridge expires while a separate purchase is processed.
- Storing Type I water in a tank or bottles; Type I must be dispensed fresh, and the tank should hold Type II/III water behind a CO2/bacteria vent filter.
- Forgetting the site: a floor drain, a feed-water point with stable pressure, a leak shut-off, earthing and a UPS/stabiliser are needed before installation.