Reagentless vs reagent
chlorine. Two ways to measure
the same residual.
Reagent methods add a chemical to react with chlorine and read the result. Reagentless sensors measure it directly with no added chemical. A balanced comparison of how each works and where each fits in continuous monitoring.
Example readings for illustration purposes
What you can’t see
is already costing you.
Issues are flagged after damage is done, not before it starts. Every delayed alert is a cost you didn’t have to carry.
Manual records, missed checks, and audit gaps across sites. When an inspector asks for evidence, the scramble begins.
pH, chlorine, or turbidity can shift for days or weeks before anyone notices. Without real-time monitoring, you’re always reacting.
Continuous monitoring.
Instant alerts. Full audit trail.
Three connected layers that turn raw sensor data into actionable intelligence, automatically.
Connected sensors stream real-time data across all parameters, 24 hours a day. Cellular and LoRaWAN telemetry with encrypted payloads.
Threshold breaches trigger instant SMS, email, or app notifications. Escalation rules and role-based routing ensure the right person acts.
Cloud dashboards give your team the data, trendlines, and records they need, instantly. Every reading logged, every action auditable.
Every parameter.
One connected system.
From standard chemistry to full-spectrum UV-Vis sensing, AQUAIOT covers every dimension of water quality your operation demands.
Continuous acidity and alkalinity monitoring. Detect corrosion risk, Legionella-risk conditions, and treatment performance drift.
Detect particulate contamination, filter breakthrough, and process upsets in real time.
Continuous disinfection residual monitoring. Ensure treatment efficacy without manual sampling delays.
Monitor oxygen levels critical for biological process control, aeration efficiency, and environmental compliance.
Track dissolved mineral content and detect contamination events, cross-connections, or treatment changes in real time.
Specsens UV-Vis sensing at the edge. Detect organic load, humic substances, and complex contamination signatures beyond single-parameter sensors.
Detect apparent and true colour changes that may indicate natural organic matter, iron, manganese, or treatment by-products.
Oxidation-reduction potential monitoring for disinfection effectiveness, redox conditions, and process control in treatment and distribution.
Want the full technical specifications for every sensor?
Download DatasheetSame residual, two routes to the reading.
Reagent-based chlorine measurement works by adding a chemical reagent that reacts with the chlorine in the sample, producing a measurable change such as a colour shift. This is the long-established method behind many laboratory and colorimetric measurements and it is well understood. Its trade-off in a continuous monitoring context is the reagent itself. Reagents are consumables that must be stored, replenished and disposed of, which adds ongoing cost and maintenance to a permanent installation.
Reagentless chlorine sensors measure the residual directly, without adding any chemical to the sample. For continuous online monitoring this is attractive because it removes the consumable supply chain, reduces routine maintenance visits and avoids reagent disposal. AQUAIOT measures free and total chlorine continuously with the SPS-CI-C sensor and the dedicated SPA Chlorine Analyzer, streaming readings to the cloud with threshold alerts so disinfection residual is watched in real time. The right method depends on the application, but for continuous, low-touch monitoring a reagentless approach removes a recurring operational burden.
- Reagent methods add a chemical that reacts with the chlorine
- Reagents are consumables to store, replenish and dispose of
- Reagentless sensors measure the residual directly, no chemical added
- Reagentless suits continuous, low-maintenance online monitoring
Reagentless vs reagent
Integrated monitoring systems,
not just sensors.
AQUAIOT combines connected sensors, cloud visibility, and engineering support into end-to-end deployments built around your infrastructure.
Integrated online monitoring system combining multiple sensing modalities, cloud telemetry, and dashboard connectivity in a single deployable unit.
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Versatile multi-parameter instrument supporting simultaneous measurement across key water quality indicators with flexible sensor configuration.
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Dedicated chlorine analysis with continuous free and total chlorine measurement, built for treatment, distribution, and compliance-relevant applications.
View productFrom sensor edge to
operations dashboard
Every AQUAIOT deployment is built for the operational realities of UK water and estates teams, retrofit-friendly, open to your existing systems, and supported by engineers who understand what you’re monitoring and why.
- Cellular + LoRaWAN telemetry with encrypted payloads
- Over-the-air configuration & firmware management
- RS485/Modbus · APIs for SCADA, AIMS/CAFM & analytics
- Role-based dashboards, trendlines, alarms & exports
- Exportable, audit-ready compliance records
Every reading. Every alert.
Every record. In one place.
Your monitoring data consolidated into a single cloud platform, built for operations, not just engineers.
Role-based cloud views with trendlines, threshold alarms, and multi-site visibility. Export data directly to your analytics stack.
Audit-ready trails generated automatically. Exportable logs and API integration with BMS, CAFM, and compliance platforms.
SMS, email, and app notifications with escalation rules and role-based routing. Your team is notified before issues escalate.
Over-the-air firmware updates and remote sensor configuration. Reduce site visits and keep systems current without disruption.
The engineering partner,
not just the hardware supplier.
AQUAIOT brings years of engineering experience alongside cutting-edge technology, so your deployment doesn’t end at the sensor.
Site survey, installation, commissioning, dashboard setup, training, and post-installation support. We see it through.
Clamp-on ultrasonic flow meters and non-invasive sensors. No pipework cutting, no service shutdown, no disruption to live systems.
RS485/Modbus, APIs, SCADA, AIMS/CAFM integration. Built to connect, not to lock you in to a closed ecosystem.
Hampshire-based team offering on-site and remote technical support. Real engineers, available when it matters.
Built for operational teams
who need to know.
Water quality monitoring isn’t one-size-fits-all. AQUAIOT deploys across the full range of UK water and estates operations.
Chlorine measurement questions
What is the difference between reagentless and reagent chlorine measurement?
Why does reagentless suit continuous monitoring?
Is reagent-based measurement still useful?
How does AQUAIOT measure chlorine?
Explore chlorine monitoring
See how AQUAIOT measures chlorine continuously and how it fits the wider parameter picture.
Watch your residual
without the reagents.
Speak to an AQUAIOT engineer about continuous, reagentless chlorine monitoring across your treatment and distribution assets. No commitment required.
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