How to Compare Water Quality Before and After Treatment with Linshang LS310 Malaysia
How to Compare Water Quality Before and After Treatment with Linshang LS310 Malaysia
How can you determine whether water conditions have changed after filtration or treatment?
One practical approach is to measure the water before and after treatment using the same instrument and a consistent sampling procedure.
The Linshang LS310 Water Quality Tester measures six parameters:
COD
TOC
TDS
UV275
EC
Temperature
This makes it useful for comparative screening of suitable water samples before and after filtration, RO treatment or other water treatment processes.
Why Before-and-After Testing Is Important
Testing only the treated water gives you one set of results.
It does not tell you what the water looked like before treatment.
A better comparison is:
Raw Water → Treatment → Treated Water
By measuring both samples, users can observe changes across the treatment process.
This approach can be useful for:
Water filtration companies
RO system suppliers
Factories
Facility management teams
Water treatment contractors
Building maintenance departments
Step 1: Identify the Sampling Points
The first step is to determine where samples should be collected.
For a simple filter:
Point A – Before Filter
Point B – After Filter
For an RO system:
Point A – Feed Water
Point B – RO Product Water
For a larger treatment system:
Raw Water → Pre-Treatment → Main Treatment → Final Water
Consistent sampling locations make future comparisons more meaningful.
Step 2: Establish the Baseline
Before evaluating changes, establish normal readings when the system is operating correctly.
Record the six LS310 parameters.
These baseline measurements provide a reference for future testing.
Without baseline data, it can be difficult to determine whether a later reading is actually unusual.
Step 3: Use a Consistent Sampling Method
For meaningful comparisons, try to keep the sampling procedure consistent.
Consider factors such as:
Sampling location
Sample container
Water temperature
Collection procedure
Instrument procedure
Timing
Avoid comparing samples collected using significantly different methods.
Step 4: Measure COD
COD provides an indicator associated with oxidizable substances in the sample.
Comparing COD-related readings before and after treatment can provide additional information beyond TDS alone.
However, the interpretation should be appropriate to the instrument and application.
For formal compliance testing requiring a specified COD method, the required standard method should be followed.
Step 5: Measure TOC
TOC provides information related to organic carbon.
For systems intended to change certain organic characteristics of water, TOC-related measurements can provide useful comparative information.
Again, the strongest use of portable screening is often comparison and trend monitoring rather than replacing detailed laboratory analysis.
Step 6: Compare TDS
TDS is one of the most familiar parameters in water filtration.
Users commonly compare:
TDS Before Treatment vs TDS After Treatment
This can be particularly useful for RO systems.
However, different treatment technologies are designed for different purposes, so TDS should not be used as the sole measure of every filtration system's effectiveness.
Step 7: Compare EC
Electrical conductivity provides another indicator related to dissolved ions.
For RO and other treatment systems, EC can be useful for comparative monitoring.
Because the LS310 measures both TDS and EC, users can record both values during the same testing session.
Step 8: Record UV275 and Temperature
The LS310 also provides UV275 and temperature.
These readings should be recorded together with the other parameters to create a more complete measurement history.
Temperature is especially useful as contextual information when comparing samples collected at different times.
Before-and-After Testing Example
A simple record could look like this:
Sample A – Incoming Water
COD: Record result
TOC: Record result
TDS: Record result
UV275: Record result
EC: Record result
Temperature: Record result
Sample B – Treated Water
COD: Record result
TOC: Record result
TDS: Record result
UV275: Record result
EC: Record result
Temperature: Record result
The objective is to compare the two sets of measurements.
Application: RO System
For an RO system, a useful comparison is:
Feed Water → RO Product Water
Routine monitoring can help technicians observe changes over time.
If the treated-water readings begin moving away from their established baseline, further inspection may be appropriate.
Application: Water Filter Service
Water filtration technicians can perform measurements during service visits.
For example:
Before Maintenance → Service / Filter Replacement → After Maintenance
This creates a measurable record of conditions before and after service.
It can also support a more technical discussion with the customer.
Application: Factory Water Treatment
Factories may have several treatment stages.
A monitoring plan could include:
Incoming Water → Filter → RO → Storage → Point of Use
Portable measurements can help the maintenance team identify where a significant change appears within the system.
Does a Lower Reading Always Mean Better Treatment?
Not necessarily.
This is an important point.
Different parameters represent different characteristics, and different treatment systems are designed for different purposes.
For example, a sediment filter is not designed to perform the same function as an RO membrane.
Therefore, users should interpret changes according to:
Treatment technology
Parameter being measured
Application
Normal baseline
Manufacturer specifications
Avoid assuming that every parameter must simply become lower after every type of treatment.
Can LS310 Prove That a Filter Removes Every Contaminant?
No.
The LS310 does not identify every possible contaminant.
Specific testing may be required for substances such as:
Heavy metals
Microorganisms
Pesticides
Specific industrial chemicals
Other regulated contaminants
If a filtration system makes a specific removal claim, the appropriate test method should be used to verify that claim.
Why Trend Monitoring Is More Valuable
Instead of measuring only once after installation, users can establish a long-term record:
New Filter → Month 1 → Month 2 → Month 3 → Filter Replacement
This can help technicians understand how the system behaves over time.
The same principle applies to RO membranes and larger treatment systems.
Portable Testing vs Laboratory Analysis
The LS310 is particularly useful for:
Rapid screening
Before-and-after comparison
Routine monitoring
Trend analysis
Field measurement
Laboratory testing remains important for:
Regulatory compliance
Accredited results
Specific contaminant analysis
Drinking water certification
Detailed chemical or microbiological testing
The two approaches can complement each other.
Water Treatment Testing Malaysia
For Malaysian water filtration companies, RO suppliers, factories and facility management teams, the Linshang LS310 provides a practical way to compare multiple water quality indicators before and after treatment.
Rather than relying on TDS alone, users can record COD, TOC, TDS, UV275, EC and temperature to create a broader routine monitoring record.
Looking for Linshang LS310 Water Quality Tester in Malaysia?
MTM Precision supplies professional water quality, environmental and industrial testing instruments in Malaysia.
Contact our team to discuss your filtration, RO system, water treatment or routine water quality monitoring application.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia
🌐 Website: www.mtmpre.com.my
📧 Email: mtmpre@yahoo.com
📱 WhatsApp: +6016-660 7346
16 Aug 2026
