Between planned maintenance visits

Protect water quality at source.

A practical cross-platform routine for controlled water quality, earlier warning signs and fewer downstream analytical problems.

WATER SYSTEMSLaboratory water purification system housekeeping guide
Water quality is created—and can be lost—at every point of use.Routine monitoring, clean dispensing, controlled storage and prompt response to deterioration protect every downstream preparation and analysis.

Take the routine into the laboratory

Choose a practical monthly task sheet for a physical instrument folder or an electronically completed laboratory record.

↓ Print-friendly PDF2-page A4 landscape · Rev 02
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↓ Electronic record PDF2-page A4 landscape · Rev 02
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Annual servicing is one important control—not a year-round maintenance strategy.
Laboratory water systems experience changing feed quality, continuous purification demand, storage and recirculation effects, consumable exhaustion and point-of-use contamination throughout the year. Their condition needs maintaining between service visits through quality review, hygienic handling, planned sanitisation and timely response to decline or alarm.
ISOISO 3696:1987 ↗
Laboratory action

The laboratory’s role

Select the frequency that applies today and complete the checks shown.

⚠

Pause and investigate when you see:

Small changes can become preventable failures when they are allowed to persist.

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Quality decline or instabilityResistivity falls, conductivity or TOC rises, or values vary with recirculation, demand or time beyond the established pattern.
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Reduced production or dispense flowProduction rate, pressure, reservoir recovery or point-of-use flow changes unexpectedly.
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Microbial or hygiene concernAdverse microbial trend, odour, slime, visible growth, wet external surfaces or repeated post-filter concern appears.
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Leak, drain or reservoir issueWater appears around fittings, cartridges, tank or bag, drain, drip tray, dispenser or remote point.
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Recurring consumable or sanitisation warningA cartridge, filter, lamp, membrane, pretreatment or sanitisation message becomes due early, repeats or will not clear after correct action.
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Monitoring or specification gapA required result, display value, sampling record or alarm history is missing, implausible or cannot demonstrate suitability for use.
One care standard · three OEM perspectives

Apply the routine to your instrument

Start with the cross-platform routine, then use the emphasis relevant to your installed system.

Exact commands, parts, intervals and acceptance criteria remain model- and method-specific.

Evidence and source library

Water-quality standards, conditional pharmaceutical guidance and OEM material supporting this cross-platform practical guide.

Primary sources
ISO 3696:1987 · Water for analytical laboratory useCurrent confirmed specification for three grades used in analysis of inorganic chemicals. It explicitly does not cover organic trace analysis, surfactants, or biological and medical analysis.
View ISO scope ↗
USP <1231> · Water for Pharmaceutical PurposesApply the current controlled informational chapter where relevant. No open-access substitute is presented as the chapter itself.
Controlled chapter
WHO TRS 1033 Annex 3 · GMP: water for pharmaceutical usePublic guidance for bulk pharmaceutical-water production, storage and distribution. WHO states that it excludes production, storage and use of water in quality-control laboratories.
Open WHO PDF ↗
Laboratory quality context · ISO/IEC 17025:2017 | ISO 15189:2022Apply where relevant. These standards support suitable equipment and valid activities but do not define one universal water grade or housekeeping schedule.
Reference standards

References are provided for transparency. ISO 3696 is limited to inorganic analytical work and excludes several applications. USP <1231> is informational and applies within its pharmaceutical scope. WHO TRS 1033 Annex 3 concerns bulk pharmaceutical-water systems and explicitly excludes quality-control laboratory water use. The intended application, approved specification, monitoring plan, OEM manual and SOP remain controlling. Exact sanitisation and consumable procedures are configuration-specific.

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Routine housekeeping protects condition and makes deterioration visible sooner.This guide supports—not replaces—governing requirements, validated methods, OEM instructions or qualified engineering intervention.