The numbers below come from factory testing. Each MODEL shares the same core purification path but differs in final polishing stages.

Technical Specifications

Laboratory Water Purification System Specifications

Available Models

• MSLWPS220SWISS – Standard Type
• MSLWPS220FSWISS – Endotoxin Eliminating Type

Production & Dispensing Capacity

·   Production Rate: 20 L/hour

·   Dispensing Rate: Up to 2 L/min

Ultra-Pure Water Quality

MSLWPS220SWISS (Standard Type)

·   Resistivity (25°C): 18.2 MΩ·cm

·   Conductivity (25°C): 0.055 μs/cm

·   TOC: 5 ppb

·   Particles: <1/ml (>0.2 μm)

·   Bacteria: <0.01 CFU/ml

MSLWPS220FSWISS (Endotoxin Eliminating Type)

·   Resistivity (25°C): 18.2 MΩ·cm

·   Conductivity (25°C): 0.055 μs/cm

·   TOC: 5 ppb

·   Particles: <1/ml (>0.2 μm)

·   Bacteria: <0.01 CFU/ml

·   Endotoxin: <0.001 EU/ml

·   RNases: 1 pg/ml

·   DNases: 5 pg/ml

·   Protease: 0.15 μg/ml

RO First-Stage Water Quality

·   Ion Rejection Rate: 98%–99% (with new RO module)

·   Organic Rejection Rate: >99% (MW >300 Dalton)

·   Particle & Bacteria Rejection Rate: >99%

Feed Water Requirements

·   Water Source: Tap Water

·   Pressure: 1–6 bar

·   Temperature: 5–40°C

·   Conductivity: <2000 μs/cm

·   Total Hardness (as CaCO₃): <300 ppm

·   TOC: <2000 ppb

·   Free Chlorine: <3 ppm

·   pH Range: 4–10

·   Dissolved CO₂: <30 ppm

Electrical & Physical Specifications

·   Power Supply: 100–240V, 50/60Hz

·   Total Power Consumption: 48W

·   Dimensions (L × W × H): 273 × 555 × 568 mm

·   Weight: Approx. 21 kg

Scope of Application

MSLWPS220SWISS

Suitable for:

·   Physical and chemical testing

·   Biochemical analysis

·   Blood testing

·   Micro-analysis

·   Laboratory washing

·   HPLC, IC, GC applications

·   General analytical experiments

MSLWPS220FSWISS

Ideal for:

·   High-sensitivity ICP/MS

·   PCR applications

·   ppt-level analysis

·   Isotope analysis

·   Molecular biology

·   Life science research

·   Disease control centers

·   Drug testing institutes

·   Quality inspection laboratories

·   University research laboratories

·   High-end precision analytical instruments

Benefits for your laboratory work

The features above produce measurable gains in daily operations. Each point below connects a specification to a practical outcome.

Consistent 18.2 MΩ·cm resistivity every day – The two‑stage purification (RO followed by DI ion‑exchange) delivers ultrapure water at the theoretical maximum resistivity. No conductivity drift between morning and afternoon batches. Calibration standards and mobile phases prepared with this water produce stable baselines across weeks of HPLC runs.

Low bacterial counts protect sensitive assays – The system maintains <0.01 CFU per ml. For molecular biology work, the MSLWPS220FSWISS model also removes RNases and DNases. PCR reactions set up with this water show no unexpected nuclease degradation. Cell culture media prepared from it support consistent growth across passages.

Fast water access reduces waiting time – The built‑in 1.8 litre pressure tank and 2 L per minute dispensing rate mean no pause between filling flasks. A researcher preparing 10 litres of buffer collects it in under six minutes. The tank refills automatically at 20 L per hour during other tasks.

High RO rejection saves polishing cartridges – The single RO module removes 98% to 99% of incoming ions and >99% of organics and particles. This pretreatment extends the life of the expensive DI and UV polishing stages. Replacement frequency drops, and per‑litre consumable cost falls.

One system serves multiple applications – The base MSLWPS220SWISS handles general analytical work. The MSLWPS220FSWISS adds endotoxin, RNase, and DNase removal for life science assays. Both produce RO water (first‑stage) and ultrapure water simultaneously. One tap for glassware rinsing, another for critical chromatography.

Common frustrations with laboratory water

Pain point: Water purity changes when the RO membrane ages.
Some purifiers lose rejection efficiency gradually, letting ions slip through. The Master Science MSLWPS220SWISS and MSLWPS220FSWISS ultra‑pure water purifier (a dual‑output system with resistivity monitoring) shows real‑time conductivity on the LCD screen. When RO rejection drops below 95%, the display prompts a membrane change. No silent drift into poor water quality.

Pain point: Endotoxin contamination ruins cell culture experiments.
Standard ultrapure water lacks endotoxin removal. A single contaminated batch kills an entire week's work. The same Master Science MSLWPS220FSWISS ultra‑pure water purifier (a endotoxin‑removing model for cell culture) includes a proprietary polishing stage that reduces endotoxin to <0.001 EU per ml. Media prepared from this water supports sensitive cell lines without unexplained death or differentiation.

Pain point: Organic leachates from old tubing appear in TOC measurements.
Some systems use polymer tubing that releases plasticisers over time. The Master Science LWP‑S2 Series ultra‑pure water purifier (a low‑TOC system with high‑purity fluid path) maintains TOC below 5 ppb in the standard model. For ultra‑trace organic work, the Low TOC and Synthesizing configurations drop TOC to 2 ppb. No ghost peaks in gradient HPLC.

Pain point: The system runs dry in the middle of an experiment.
A 1 litre reservoir runs out quickly when dispensing at 2 L per minute. The Master Science MSLWPS220SWISS and MSLWPS220FSWISS ultra‑pure water purifier (a system with a built‑in pressure tank) holds 1.8 litres of ready water. The tank refills automatically from the 20 L per hour production stream. A researcher can dispense 1.5 litres, work for ten minutes, and find the tank already full again.

Pain point: No record of water quality for audit trails.
Accredited laboratories need documentation of water purity at the time of use. The Master Science MSLWPS220SWISS and MSLWPS220FSWISS ultra‑pure water purifier (a system with automatic data logging) displays resistivity, temperature, and TOC (on applicable models) in real time. Operators record values in logbooks or connect to a printer. Audit preparation takes minutes instead of hours.

Which laboratories choose these models

Analytical chemistry laboratories (HPLC, GC, IC, ICP‑MS) choose the MSLWPS220SWISS for its 18.2 MΩ·cm resistivity and <5 ppb TOC. Trace metal analysis requires the low TOC configuration to avoid organic interferences.

Molecular biology laboratories (PCR, qPCR, electrophoresis) choose the MSLWPS220FSWISS for its RNase‑free, DNase‑free, and endotoxin‑free output. Nucleic acid purification and gel preparation succeed consistently.

Cell culture facilities choose the MSLWPS220FSWISS for endotoxin removal to <0.001 EU per ml. Media, buffers, and washing solutions support adherent and suspension cell lines without unexplained toxicity.

Pharmaceutical quality control chooses either model depending on the monograph. The MSLWPS220SWISS meets USP <643> and <645> requirements for purified water. The MSLWPS220FSWISS adds the endotoxin control needed for parenteral product testing.

Clinical diagnostic laboratories choose the MSLWPS220SWISS series for biochemistry analyser feed water. The 20 L per hour production rate matches typical daily consumption of 80 to 120 samples. The built‑in tank buffers against peak demand during morning runs.

Physical installation

The unit occupies a bench footprint of 273 mm wide by 555 mm deep. Height is 568 mm, which fits under most laboratory wall cabinets. The 21 kg weight allows two people to lift it onto a bench. Tap water connection uses a standard ¾ inch or ½ inch fitting (adapters supplied). The drain line goes to a sink or floor drain.

Power requirement is 100–240 V AC, 50 or 60 Hz. The 48 W consumption adds minimal heat load to the laboratory. The LCD screen is readable from standing height.

Included in the box

Each MSLWPS220SWISS or MSLWPS220FSWISS ships with:

• Main purification unit with installed RO membrane and DI cartridge
• Built‑in 1.8 litre pressure tank
• LCD display controller
• Feed water connection kit
• Drain tubing
• Product water dispensing nozzle
• Power cord (country‑specific plug)
• Installation guide and user manual
• Initial set of disposable cartridges (PP sediment filter, activated carbon)
• Calibration certificate for resistivity and temperature

The user must supply a suitable drain and a non‑return valve on the feed line if local plumbing codes require it.

Consumables and replacement schedule

The manufacturer recommends the following replacement intervals under typical tap water conditions:

·       PP sediment filter (5 μm): every 3 to 6 months

·       Activated carbon cartridge: every 6 to 12 months

·       RO membrane: every 12 to 24 months (or when rejection drops below 95%)

·       DI polishing cartridge: every 6 to 12 months (or when resistivity drops below 18.0 MΩ·cm)

·       UV lamp (where fitted): every 12 months

·       Endotoxin removal cartridge (MSLWPS220FSWISS only): every 12 months or when endotoxin breakthrough detected

All replacement parts are available from us. The quick‑fit cartridge design allows changeout without tools.

Ordering information

Customers specify the model number when ordering:

·       MSLWPS220SWISS – Standard configuration, <5 ppb TOC, general analytical use

·       MSLWPS220FSWISS – Endotoxin‑removing configuration, <0.001 EU/ml, RNase‑free, DNase‑free, for cell culture and molecular biology

Each model includes the built‑in pressure tank and LCD display.

Request a quotation

For pricing, lead time, or a technical datasheet for the MSLWPS220SWISS or MSLWPS220FSWISS, contact us. Include your feed water analysis if available. We will recommend the correct pretreatment configuration based on local tap water hardness and TOC levels.