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Industrial utility plant with large cooling-water infrastructure and process piping

EVERKLIN / WATER TREATMENT

Smart chemistry. Stronger cooling performance.

Advanced cooling-water treatment programmes designed around water chemistry, system conditions, metallurgy and operating objectives.

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6 programme families · Site-specific selection review

Everklin Living Process Platform

Open recirculating cooling-water system

Follow make-up, circulation, heat rejection and blowdown while exploring the operating challenges that shape a cooling-water programme.

Process stateNORMAL OPERATION
Realistic three-dimensional cooling-water system with cutaway tower, basin, pump, dosing, heat exchanger and blowdown
System overviewMineral deposition on heat-transfer surfaces

Select any numbered process point to inspect its operating challenge and treatment context.

Process stages
Monitoring referencesNo live plant values are shown.
ConductivitypHORPTemperatureMicrobial CountHardness
+1 more
Chlorides
Treatment family

Everklin programme

Final selection is coordinated through the single technical review at the end of this page.
View programme

TECHNICAL REFERENCE

Understand the system before selecting treatment.

System fundamentals & operating path

A cooling tower is part of a heat-rejection system in which circulating water absorbs heat from process equipment and releases part of that heat primarily through evaporative cooling.

The actual arrangement varies by system. Treatment therefore starts with the water, equipment and operating context rather than a universal programme.

  1. Makeup water
  2. Recirculation
  3. Heat exchange
  4. Evaporation
  5. Blowdown & drift
  6. Makeup balance

Evaporation removes water while many dissolved constituents remain. Makeup replaces evaporation, blowdown, drift and other losses. Cycles of concentration are assessed from suitable conservative constituents or conductivity where valid; process contamination and chemical additions can distort the ratio. Increasing cycles saves makeup only within the limits set by chemistry, corrosion and biological control.

Hot water from process
Warm return water carries process heat back to the tower.
Distribution system
Water is distributed across the heat-transfer area.
Fill / heat-transfer area
Water is spread to support heat and mass transfer.
Air + water contact
Air movement supports evaporative heat rejection.
Evaporative heat rejection
A portion of water evaporates and removes heat.
Cold-water basin
Cooled circulating water collects for return to the process.
Recirculation to process
The pump returns cooled water to heat exchangers or the process loop.

Cooling water · CONNECTED WORKSPACE

Find the right treatment programme.

Start with the operating problem, review the evidence, understand what should be checked, and explore the relevant Everklin treatment programme in one connected workspace.

  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

Hardness, alkalinity & heat-transfer scale

Minerals can precipitate on hot heat-transfer surfaces as water concentrates and local conditions differ from the bulk sample.

What you may notice

Hard deposits, reduced heat transfer, higher approach temperature or increasing pressure loss.

Possible contributors

High calcium hardness or alkalinity, elevated pH, excessive cycles, high surface heat flux and interrupted treatment.

What we would review

  • Assess makeup
  • circulating-water hardness
  • alkalinity
  • pH
  • temperature
  • cycles
  • identify deposits
  • review heat duty

Treatment approach

Review cycles, blowdown, pH and pretreatment together with an inhibitor/dispersant approach suited to the operating envelope.

Mechanism, monitoring & limitations

Mechanism

Educational families include phosphonates, polyacrylates, polycarboxylates, maleic-acrylic and sulfonated polymers. Threshold inhibition, crystal modification and dispersion are different mechanisms.

Monitor

Conductivity, pH, hardness, alkalinity, treatment residual, blowdown and exchanger temperatures.

Compare deposit formation, heat-transfer performance and water balance over a representative load period.

Limitations

Confirmed adherent scale may require controlled offline cleaning after deposit and metallurgy review; inhibitors are not universal descalers.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Insulating deposits can reduce duty and create under-deposit corrosion sites.
Information needed for assessment
Makeup/circulating analyses, recirculation and makeup flows, cycles, heat load, metallurgy and deposit records.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

High silica, high TDS & high cycles

Concentration can bring silica or other salts outside the safe envelope even when carbonate control appears satisfactory.

What you may notice

Persistent glassy or mixed deposits, declining thermal performance or recurring fouling at high cycles.

Possible contributors

High-silica makeup, restricted blowdown, changed source chemistry, high heat flux or a conductivity target unrelated to individual ions.

What we would review

  • Measure silica
  • magnesium
  • hardness
  • alkalinity
  • chloride
  • sulfate
  • pH
  • temperature in both streams
  • reconcile blowdown

Treatment approach

Set cycles from the limiting constituents and metallurgy; evaluate pretreatment, dispersion and a site-specific silica strategy.

Mechanism, monitoring & limitations

Mechanism

Specialized dispersing/scale-control approaches require formulation evidence. Ordinary carbonate inhibition is not universal silica control.

Monitor

Silica and conservative-ion concentration, pH, conductivity, blowdown response and heat duty.

Check deposit recurrence and stable thermal performance while confirming actual makeup and blowdown volumes.

Limitations

Analyse mixed silica deposits before selecting a compatible offline method.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Difficult deposits and increased corrosion potential at concentrated salt levels.
Information needed for assessment
Ion analysis, cycles history, exchanger conditions, makeup variation and deposit identification.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

Low-phosphorus or phosphate-free requirements

Discharge limits or reuse conditions may require a different balance of scale and corrosion control.

What you may notice

A compliance-driven treatment review, phosphate-related deposits or a need to change the existing programme.

Possible contributors

Phosphorus restrictions, wastewater constraints or interactions with concentrated calcium.

What we would review

  • Establish discharge criteria
  • phosphorus contributions
  • metallurgy
  • water chemistry
  • present corrosion/scale performance

Treatment approach

Evaluate a lower-phosphorus approach through compatibility review, monitored trials and effluent impact—not a direct like-for-like substitution.

Mechanism, monitoring & limitations

Mechanism

Polymer-based dispersion and alternative corrosion-inhibition families are educational options; availability and suitability must be confirmed.

Monitor

Total phosphorus where relevant, corrosion indicators, deposits and treatment residuals appropriate to the selected chemistry.

Demonstrate both equipment protection and the required discharge outcome during a controlled trial.

Limitations

Existing deposits require separate identification and cleaning review before programme conversion.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Removing one ingredient without replacing its function can weaken equipment protection.
Information needed for assessment
Discharge requirements, complete analyses, current chemistry, corrosion history and operating envelope.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

General, localized & under-deposit corrosion

Corrosion can cause uniform metal loss or localized attack; deposits, microbial activity and mixed-metal contact create different risk mechanisms.

What you may notice

Rust, elevated dissolved metals, leaks, pitting or loss measured by coupons/probes.

Possible contributors

Unsuitable pH, dissolved oxygen, high chloride, temperature, poor inhibitor delivery, galvanic coupling or deposits.

What we would review

  • Identify carbon steel
  • copper/brass
  • stainless steel
  • aluminium
  • mixed metallurgy
  • assess pH
  • chloride
  • conductivity
  • oxygen
  • deposits

Treatment approach

Address flow/deposits and galvanic factors, then select a metallurgy-specific inhibition and monitoring plan.

Mechanism, monitoring & limitations

Mechanism

Phosphate, phosphonate, molybdate, azoles, film-forming and multi-component approaches have different roles. Benzotriazole/tolyltriazole relate to copper-alloy protection, not universal protection for every metal.

Monitor

Representative coupons/probes, iron/copper, pH, chloride, inhibitor residual and visual inspection.

Assess corrosion rates and localized damage together over adequate exposure periods and actual operating conditions.

Limitations

Review deposit removal and passivation with material compatibility; aggressive cleaning can expose or worsen damaged surfaces.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Leaks, equipment failure and corrosion debris feeding further fouling. Bulk-water results alone can miss localized attack.
Information needed for assessment
Metallurgy, failure locations, analyses, coupon/probe history, treatment and operating temperatures.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

Microbial growth, slime & biofilm

Attached organisms and EPS can trap solids, restrict heat transfer and promote microbiologically influenced corrosion.

What you may notice

Slime, odour, fouled fill or exchangers, elevated microbial indicators and recurring deposits.

Possible contributors

Warm water, nutrients, airborne material, process leaks, sunlight, dead legs and low-flow areas.

What we would review

  • Review bulk-water
  • surface indicators
  • nutrient sources
  • dead legs
  • process leaks
  • treatment delivery

Treatment approach

Combine source control, physical cleanliness, hydraulic improvement and an assessed microbial-control programme.

Mechanism, monitoring & limitations

Mechanism

Oxidizing and non-oxidizing biocides act on organisms; biodispersants target attached material. Their roles and compatibility must be distinguished.

Monitor

Appropriate microbial tests, surface condition, oxidant residual where applicable, pH, heat transfer and corrosion indicators.

Check sustained biological control at representative locations, not only a sample immediately after dosing.

Limitations

Established deposits may require planned cleaning and disinfection by qualified personnel under the site safety procedure.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Heat-transfer loss, corrosion and hygiene concerns. Chemical treatment is not a replacement for a site water-management and safety programme.
Information needed for assessment
Water-management plan, system layout, microbial results, temperature, nutrient/contamination history and current treatment.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

Oxidizing biocide control

An oxidant programme must achieve effective delivery while remaining compatible with materials, other treatment and discharge requirements.

What you may notice

Unstable residual, persistent growth despite dosing, or corrosion and compatibility concerns.

Possible contributors

Changing oxidant demand, pH, organic contamination, poor mixing, underfeed or excessive losses.

What we would review

  • Measure the relevant active residual directly
  • review pH
  • contact opportunity
  • demand
  • distribution

Treatment approach

Assess oxidant selection, dosing point, distribution and verified residual against the site programme.

Mechanism, monitoring & limitations

Mechanism

Chlorine, bromine and chlorine dioxide are distinct educational families with different behaviour. Never mix chemicals or improvise generation procedures.

Monitor

Direct residual, pH, microbial indicators and ORP as supporting context—not a universal residual measurement.

Correlate distribution and residual with microbial trends and corrosion observations.

Limitations

Oxidant feed alone may not remove mature biofilm or mineral deposits; assess controlled physical/chemical cleaning.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Insufficient control from underfeed or adverse material/discharge effects from overfeed.
Information needed for assessment
Oxidant identity, residual trends, pH, system volume/flow, demand, materials and discharge requirements.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

Non-oxidizing biocides & programme rotation

Non-oxidizing agents have different modes of action and compatibility, and require an exposure strategy suited to the system.

What you may notice

Recurring microbial indicators or slime despite the current programme.

Possible contributors

Persistent growth, oxidant limitations, unsuitable contact opportunity or repeated reliance on an ineffective approach.

What we would review

  • Review organisms/indicators
  • pH
  • temperature
  • demand
  • retention time
  • discharge constraints
  • dosing history

Treatment approach

Assess one or more compatible treatment modes and monitoring. Dual or rotation programmes are conditional, not automatic resistance-prevention guarantees.

Mechanism, monitoring & limitations

Mechanism

Isothiazolinones, glutaraldehyde, DBNPA, THPS and quaternary ammonium compounds are educational examples, not statements of Everklin stock or approved dose.

Monitor

Programme-specific delivery/exposure records, microbial response, surface condition and blowdown.

Review repeated sampling and deposit control over representative operation.

Limitations

Combine qualified biofilm-removal planning where needed; killing organisms does not itself remove attached solids.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Ineffective control or incompatible treatment when products are selected only by category name.
Information needed for assessment
Current chemistry, water conditions, microbial history, dosing schedule and discharge route.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

Biodispersants & attached-deposit removal

A biodispersant helps loosen or disperse attached biological material so it can leave the circulating system.

What you may notice

Persistent slime, heat-transfer loss or rapid recolonization despite acceptable bulk-water results.

Possible contributors

Established EPS, trapped solids and biofilm that remains after microbial killing.

What we would review

  • Inspect surfaces
  • solids loading
  • filtration
  • blowdown capacity
  • review compatibility with the biocide
  • materials

Treatment approach

Coordinate compatible dispersion with microbial control, filtration, controlled blowdown and inspection.

Mechanism, monitoring & limitations

Mechanism

Surface-active/biodispersing families assist detachment; they are not automatically disinfectants and are not interchangeable with biocides.

Monitor

Turbidity/solids during release, filters, surface cleanliness, microbial indicators and heat transfer.

Confirm material removal and sustained cleaner surfaces, not simply increased water turbidity.

Limitations

Heavy deposits may require offline access and physical cleaning under a site-specific safety plan.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Released material can circulate and redeposit if the removal path is inadequate.
Information needed for assessment
Surface/deposit observations, filter capacity, blowdown arrangement, biology and treatment compatibility.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

Silt, dust, corrosion debris & organic deposits

Suspended material accumulates at low-flow or heat-transfer locations and can bind with biological or mineral deposits.

What you may notice

Dirty basins, plugged strainers, exchanger pressure loss and declining thermal performance.

Possible contributors

Airborne dust, poor makeup filtration, corrosion, process leakage or inadequate solids removal.

What we would review

  • Identify deposit composition
  • particle sources
  • inspect basin condition
  • flow distribution
  • filtration

Treatment approach

Correct the source, improve appropriate filtration and assess compatible dispersion with a clear solids-removal route.

Mechanism, monitoring & limitations

Mechanism

Dispersing polymers may help keep suitable particles transportable; they do not replace filtration or basin cleaning.

Monitor

Suspended solids, filter differential pressure, deposit observations and exchanger temperatures.

Confirm lower deposited mass and stable thermal/hydraulic performance.

Limitations

Plan mechanical or compatible chemical removal according to the mixed deposit and metallurgy.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Under-deposit corrosion, microbial shelter and loss of usable heat-transfer area.
Information needed for assessment
Deposit analysis, airborne/process sources, filtration design, corrosion records and flow distribution.
  1. System
  2. Problem
  3. Evidence
  4. Check
  5. Treatment
  6. Programme

SELECTED PROBLEM

Foam, pH instability & blowdown faults

Foam and unstable chemistry can signal contamination or control faults rather than a need for another treatment additive.

What you may notice

Persistent foam, erratic pH/conductivity, excessive water use or unexpectedly high cycles.

Possible contributors

Surfactants, organics, process leaks, incompatible chemicals, sensor drift, blocked sample lines or malfunctioning bleed valves.

What we would review

  • Verify probes against grab samples
  • inspect flow
  • valves
  • reconcile water meters
  • review recent process/treatment changes

Treatment approach

Fix the contamination or control cause; assess pH adjustment, conductivity blowdown and conditional defoaming separately.

Mechanism, monitoring & limitations

Mechanism

Compatible antifoams can suppress foam when justified but do not remove its cause. Acid/alkali feed requires engineered handling and control.

Monitor

pH, conductivity, meter totals, actuator response, foam recurrence and treatment residuals.

Confirm calibrated readings, stable control and reduced foam without adverse system effects.

Limitations

Clean probes/sample systems using approved procedures and remove contamination sources; do not mix maintenance chemicals.

Exact selection and operating limits require current technical documentation and site-specific review.

Why it matters & information needed
Why it matters
Uncontrolled concentration, water loss, chemical waste and potential corrosion or scaling.
Information needed for assessment
Instrument records, flow/water balance, contamination history, chemistry and equipment limits.
System-wide selection & operating evidence

A responsible cooling-water review brings water quality, circulating-water data, operating conditions, system design, metallurgy and history into the same technical conversation.

A. Make-up-water quality

  • pH
  • Conductivity / TDS
  • Total and calcium hardness
  • Alkalinity
  • Chloride, sulfate and silica
  • Iron, suspended solids and turbidity
  • Temperature
  • Microbiological indicators where relevant

B. Circulating-water data

  • pH and conductivity
  • Cycles of concentration
  • Temperature
  • Blowdown and make-up rate
  • Circulating flow where available
  • Treatment residuals where applicable
  • Deposit trend and microbiological condition

C. System operating data

  • Recirculation rate and heat load
  • Hot- and cold-water temperature
  • Approach and range
  • Evaporation, blowdown and make-up
  • Drift information where available

D. System & metallurgy

  • Cooling tower and basin condition
  • Piping and exchanger metallurgy
  • Exchanger design and dead legs
  • Filtration and side-stream filtration
  • Dosing equipment and blowdown arrangement

E. Operating history

  • Current programme
  • Corrosion, scaling and microbiological history
  • Cleaning and maintenance history
  • Exchanger issues
  • Process contamination events
  • Seasonal changes

Water chemistry

  • Make-up and circulating-water analysis
  • Hardness, alkalinity, silica and chlorides
  • Conductivity, pH and concentration behaviour

System design

  • Open or closed circuit
  • Tower, basin, piping and exchanger metallurgy
  • Heat load, flow and low-flow areas

Operating condition

  • Cycles, make-up and blowdown
  • Scale, corrosion, deposit and biofilm history
  • Seasonal or process contamination changes

Control capability

  • Dosing and blowdown arrangement
  • Available sensors and trend data
  • Inspection, monitoring and follow-up plan

Chemistry is selected after make-up and circulating water, cycles of concentration, metallurgy, heat load, microbiological condition and the existing monitoring arrangement are reviewed together.

  1. Map the circuit
  2. Review water and metallurgy
  3. Identify dominant risks
  4. Build and monitor the programme

Monitoring & baseline

Monitoring should support technical action. The parameters reviewed depend on the system, current operating procedure and verified control capability.

Water

  • pH
  • Conductivity
  • Hardness, alkalinity and chlorides where relevant
  • Treatment residuals where applicable
  • Microbiological indicators where applicable

System

  • Make-up flow and blowdown
  • Cycles of concentration
  • Temperatures
  • Pressure / flow conditions
  • Heat-exchanger performance

Asset condition

  • Corrosion indicators
  • Deposit trend
  • Visual inspection
  • Fouling condition
  • Maintenance history

Automation

  • Existing sensor and controller arrangement
  • Chemical dosing and blowdown context
  • Trend data and technical follow-up
System & heat load
  • Tower capacity
  • Recirculation flow
  • Makeup flow
  • Blowdown flow
  • Cycles of concentration
  • Hot / cold water temperature
  • Metallurgy
  • System volume / low-flow areas
Water analysis (makeup and circulating; include units)
  • Conductivity
  • pH
  • Hardness
  • Alkalinity
  • Silica
  • Chloride
  • Sulfate
  • Iron / copper
  • Microbial results
  • Oxidant residual / ORP
Treatment & evidence
  • Current treatment and dosage
  • Dosing / blowdown arrangement
  • Corrosion coupon / probe history
  • Scaling / fouling / cleaning history

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Possible causes are not a diagnosis. Educational chemistry families do not confirm product availability. Exact treatment, compatibility and operating limits require site-specific technical review.

DOCUMENTATION & TECHNICAL SUPPORT

Keep the decision connected to evidence.

Technical documents and assessment materials are issued through the relevant Everklin review so the system and product context stays connected.

Cooling water technical questions
What are cycles of concentration?

They describe concentration in circulating water relative to makeup using an appropriate conservative constituent or conductivity where valid. Chemical additions or contamination may distort the ratio, so reconcile it with the water balance.

Should a cooling tower always run at higher cycles?

No. Makeup savings must be balanced against scaling, silica, chloride-related corrosion, biological control and discharge requirements. The limiting constituent and operating conditions determine the envelope.

What is the difference between scale and fouling?

Scale is generally precipitation of dissolved minerals. Fouling also includes silt, corrosion debris, oils and biological deposits. Mixed deposits are common and require identification.

Why does high heat flux matter?

Conditions at a hot surface can favour deposition even when a bulk-water result appears acceptable. Review exchanger duty and surface conditions together with chemistry and cycles.

Can a low-phosphorus programme simply replace the existing inhibitor?

Not without assessment. The new approach must preserve the needed scale and corrosion functions while meeting discharge constraints, with a monitored compatibility trial.

Why is metallurgy needed before corrosion treatment?

Carbon steel, copper/brass, stainless steel and aluminium have different vulnerabilities. Mixed metals, chloride, deposits and pH affect selection and monitoring.

What are azoles used for?

Azole families such as benzotriazole and tolyltriazole are considered for copper-alloy protection in suitable programmes. This is educational context, not a universal treatment or an Everklin availability claim.

What is the difference between oxidizing and non-oxidizing biocides?

They use different chemical modes of action and have different pH, demand, contact and compatibility considerations. Selection requires site-specific microbial and operating evidence.

Is ORP enough to control an oxidant programme?

Use ORP as a contextual signal only where the relationship is validated. Direct relevant residual testing, pH, distribution and microbial results remain important.

Should biocides always be rotated?

No universal schedule applies. Dual or rotation approaches may be considered after reviewing organisms, treatment response, compatibility and discharge constraints; they do not guarantee resistance prevention.

Why add a biodispersant if a biocide is already used?

Attached EPS and debris can remain after microbial killing. A compatible biodispersant may assist release, but filtration/blowdown or cleaning must remove the released material.

Can a defoamer solve every foaming problem?

No. Process leaks, surfactants, organics or treatment interactions may cause foam. Correct the source and validate suppressant compatibility if one is needed.

How do I verify cooling-water treatment performance?

Review water chemistry and residuals alongside corrosion coupons/probes, surface deposits, microbial indicators, exchanger temperatures and water balance. No single reading proves complete control.

What data supports a cooling-water assessment?

Provide makeup/circulating analyses, temperatures, flows, cycles, metallurgy, treatment/dosing records and corrosion, fouling or microbial history. Include the actual blowdown and filtration arrangement.

Available documents →Monitoring & dosing support →
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