Stable chemistry for closed water circuits.
PureGuard® Closed Loop Treatment chemicals are developed for HVAC, chilled water, heating water, glycol-water and industrial process closed circuits where corrosion control, passivation, pH stability and long-term water retention must be managed through a controlled chemical program.
Closed loop systems do not need a one-time chemical dose. They need a stable protection program.
Product selection depends on water analysis, system design and operating conditions.
Analysis First
Water analysis before product recommendation.
TDS, SDS and certificates are shared upon request.
PureGuard® Closed Loop Treatment programs are developed for systems where water is not continuously discharged like an open cooling tower. In closed circuits, corrosion products, oxygen ingress, pH drift, glycol degradation by-products and low inhibitor residuals can remain inside the loop for long periods. This makes stable chemistry and periodic monitoring essential.
The PureGuard® approach supports multi-metal corrosion control, passivation, pH buffering, deposit management and glycol-loop protection where required. Product selection should be based on system metallurgy, water quality, operating temperature, system volume, glycol type and concentration, make-up water rate, leakage history and monitoring parameters such as pH, conductivity, iron, copper, hardness and inhibitor residual.
Liberta evaluates critical closed-loop risks such as oxygen ingress, low inhibitor residual, pH imbalance, hardness contamination, iron oxide formation, copper corrosion, glycol degradation and under-deposit corrosion, so the treatment program can be aligned with actual system conditions rather than a generic inhibitor selection.
Corrosion inhibition — Help reduce corrosion risk in steel, copper alloy and mixed-metal closed water systems.
Passivation support — Support formation and maintenance of protective surface conditions after cleaning, filling or commissioning.
pH buffering and stabilization — Support stable operating pH and reduce chemistry drift in closed circuits.
Glycol-loop protection — Support corrosion control and chemistry stability in ethylene glycol or propylene glycol-water systems, subject to application review.
Deposit and corrosion-product control — Help reduce iron oxide, suspended solids and under-deposit corrosion risks through controlled chemistry and monitoring.
Commissioning and refill support — Support initial fill, flushing, passivation and chemical start-up after maintenance or system modification.
HVAC chilled water loops — Corrosion inhibition, pH stability and passivation support for closed chilled water circuits.
Heating water closed loops — Controlled chemistry for heating circuits, heat exchangers and distribution lines.
Industrial process closed circuits — Program selection based on temperature, metallurgy, water quality and operating sensitivity.
Glycol-water systems — Application-specific support for ethylene glycol or propylene glycol-water circuits, subject to glycol type and concentration review.*
Mixed-metallurgy systems — Treatment requires review of steel, copper alloys, brass, aluminum and other sensitive metals present in the loop.*
Closed circuit cooling systems — Corrosion and deposit control support for low-water-loss closed cooling circuits.
* Suitability depends on glycol type, concentration, metallurgy, temperature and water quality. Mixed-metallurgy and glycol-water systems require application-specific review.
Multi-metal corrosion control — Supports corrosion risk reduction in steel, copper alloys and mixed-metal closed loop systems.
Passivation support — Helps establish and maintain protective surface conditions after cleaning, filling or commissioning.
Glycol system protection — Supports corrosion control in glycol-water circuits when selected according to glycol type, concentration and system metallurgy.
pH stability — Supports controlled operating pH and reduces the risk of acidic or excessively alkaline loop conditions.
Deposit risk reduction — Helps reduce iron oxide and suspended corrosion-product accumulation when paired with proper monitoring and filtration.
Water and system data review — Evaluation of fill water, loop water and operating data together with metallurgy and system volume.
Product program selection — Selection of the suitable PureGuard® closed loop treatment program based on actual loop conditions.
Commissioning and passivation guidance — Support for initial fill, passivation, start-up and post-maintenance chemical treatment.
Dosage and residual control — Recommended initial dosage logic and adjustment direction based on pH, conductivity, metals and inhibitor residual.
Technical documentation — TDS, SDS and product-specific documents upon request, after application review.
Monitoring framework — Suggested control parameters for periodic closed loop monitoring and program optimization.
PRODUCT-FAMILY APPLICATION
Glycol-water loop support
Glycol-water closed loops require more than a standard closed-loop inhibitor. Ethylene glycol and propylene glycol systems can behave differently depending on glycol concentration, operating temperature, water quality, degradation tendency, oxygen ingress, metallurgy and maintenance history.
PureGuard® closed loop programs can support glycol-water circuits with corrosion inhibition, pH stabilization and deposit-risk control when the product is selected according to glycol type, concentration and system metallurgy.
| Glycol-water application | How Liberta approaches it |
|---|---|
| HVAC and chilled-water glycol loops | Application-specific treatment support for glycol-water circuits where freeze protection and corrosion control must be managed together. |
| Ethylene glycol systems | Product selection should consider glycol concentration, operating temperature, water quality and mixed-metal sensitivity. |
| Propylene glycol systems | Treatment should be reviewed according to glycol concentration, degradation tendency, pH stability and system metallurgy. |
| Industrial process glycol circuits | Controlled chemistry support for process loops where glycol condition, corrosion risk and deposit tendency must be monitored over time. |
* Suitability depends on glycol type, concentration, metallurgy, temperature, water quality and operating conditions. Glycol-water and mixed-metallurgy compatibility is not unconditional and requires application-specific review.
Closed loop program architecture
| Program stage | Main objective | Typical PureGuard® support |
|---|---|---|
| Initial fill / commissioning | Prepare the loop for stable operation and reduce early-stage corrosion risk. | Flushing support, passivation chemicals, pH adjustment and initial inhibitor dosage. |
| Normal operation | Maintain corrosion protection, pH stability and inhibitor residual over time. | Corrosion inhibitors, pH buffers, deposit-control support and glycol-compatible options. |
| Monitoring and correction | Detect chemistry drift, contamination, leakage or under-treatment before damage accumulates. | Field parameter guidance, water analysis review, dosage adjustment and technical follow-up. |
OUR APPROACH
From analysis to monitoring
Structured technical support at every stage of program selection and field review.
Analysis
Diagnosis
Treatment
Monitoring
Next step
Explore product families, request a document pack, or send water analysis for technical review.