Precision
Every solution is tailored to the system, process and required water quality.
AUTHORISED SOLENIS DISTRIBUTOR FOR SLOVENIA AND CROATIA
From raw-water analysis to a stable industrial process: chemicals, equipment, engineering, implementation, supervision and long-term technical support from one source.
ABOUT NTI
NTI d.o.o. is an engineering company based in Žalec. Since 2010, we have delivered complete water preparation and treatment solutions for industry and power generation. We design process-cooling and production-water systems.
Our key advantage is that we are not merely a chemical distributor. We combine chemistry, equipment and process knowledge into one functional solution. During regular monthly visits, we analyse water, inspect the complete system and recommend improvements that support production reliability.
Every solution is tailored to the system, process and required water quality.
We do not simply supply a product. We design, commission, monitor and optimise the complete system.
Regular visits and analyses let us track performance and recommend improvements in time.
WHAT WE OPTIMISE
Effective water treatment is about more than water quality. It protects equipment, heat transfer, process continuity, operating cost and plant safety.
Protection programs tailored to system metallurgy, operating temperatures and actual process conditions.
Control of hardness, minerals and suspended solids to preserve flow and efficient heat transfer.
Chemical and non-chemical technologies for microbiological control and cleaner system operation.
Operating-parameter optimisation for better use of water, chemicals and energy without compromising the process.
Correct water preparation and regular supervision help extend equipment life and reduce the risk of unplanned downtime.
Sampling, analysis and expert site visits turn plant data into clear recommendations for the next step.
KEY APPLICATIONS
Incoming-water quality determines the performance of every downstream process. We therefore treat water management as an interconnected system from the source through production to discharge or reuse, rather than as an isolated chemical or item of equipment.
Source analysis, mechanical filtration and quality stabilisation before further treatment.
Softening, membrane processes and demineralisation matched to production requirements.
Protection of boiler, steam, cooling, heating and closed-loop systems.
Wastewater treatment, load reduction and preparation for safe return to the process where feasible.

At elevated temperature and pressure, even small water-quality deviations can cause deposits, corrosion, foaming, steam contamination and increased energy losses.
Key challengesWe match the program to feedwater quality, pressure and condensate return: filtration and softening, reverse osmosis or EDI where required, dissolved-oxygen control, pH and alkalinity control, deposit dispersion, controlled dosing and blowdown optimisation.

In an open cooling system, pure water evaporates while dissolved salts remain and progressively concentrate. Without control of concentration cycles, blowdown and chemical balance, heat-transfer efficiency declines.
Key challengesWe combine makeup-water preparation, corrosion and scale inhibition, targeted biocide treatment or Sonoxide, AZUD side-stream filtration, conductivity-controlled blowdown, precise dosing and regular analysis. We supply, service and optimise cooling towers.

A closed circuit is not a risk-free circuit. Oxygen ingress, unsuitable pH, mixed metallurgy, glycol and suspended corrosion products can gradually impair hydraulics and heat transfer.
Key challengesWe verify water chemistry and system materials, clean and passivate the circuit where required, apply suitable inhibitors, side-stream filtration and glycol control, then regularly monitor pH, conductivity, iron and microbiological condition.

Variable well, surface or mains-water quality must be stabilised before sensitive equipment and processes to prevent downtime and premature membrane fouling.
Key challengesFollowing chemical and microbiological analysis, we define the treatment train: disc, mechanical, multimedia or activated-carbon filtration, softening and ion exchange, reverse osmosis, electrodeionisation, UV where appropriate, antiscalant dosing and key-parameter instrumentation.

Wastewater composition changes with the process, raw materials and production regime. Treatment must therefore reflect the actual load, discharge target and opportunities for reuse.
Key challengesBased on laboratory and process analysis, we combine pH adjustment, coagulation and flocculation, separation, filtration and sludge dewatering. The objective is stable performance, lower chemical use and reliable compliance with defined discharge limits.

Foam forms when surfactants, proteins, oils or organic loading stabilise air bubbles. In process water and industrial wastewater, it can reduce usable volume, cause overflow and disrupt process stability.
Key challengesWe first identify the source and character of the foam, then use laboratory or plant trials to select a compatible antifoam and the lowest effective dose. We define the dosing point and control method, then verify performance so that foam is reduced without harming filtration, membranes, biological treatment or product quality.
SYSTEM DEEP DIVE
A good solution does not end with the delivery of equipment or chemicals. We connect water parameters, equipment behaviour and process performance in a program that can be measured, supervised and continuously improved.
The objective is not to maximise cycles of concentration at any cost, but to find a safe balance between water use, chemical consumption and asset protection. The program is based on makeup-water analysis, heat load, metallurgy, temperature and airborne contamination.
Steam quality and energy efficiency depend on the complete cycle — from incoming water and deaeration to the boiler, steam distribution and condensate return. We tailor the program to operating pressure, construction and the way steam is used.
A reliable program must respond to real changes in the plant. We turn measurements into control signals and operating data into clear recommendations for operators, maintenance and production teams.
OUR SERVICES
From leading chemical programs to advanced process equipment — an integrated solution for safer operation, stable water quality and lower total cost of system management.
Authorised distributor of Solenis industrial water-treatment chemicals in Slovenia and Croatia. Advanced programs for mining, food, chemical and power industries.

Patented chemical-free microbiological water-treatment technology. Sonoxide uses ultrasound to control microbiological growth in water systems.
AZUD disc-filter distributor for Slovenia and Croatia and a pioneer in the industrial use of disc filtration in both markets. Reliable filtration for industrial, irrigation and demanding process applications.
Water-preparation equipment manufactured in the EU: softeners, reverse osmosis, electrodeionisation, filtration and dosing.
Cooling towers and cooling-tower components manufactured in the EU.
We design cooling and process-water systems, providing implementation, commissioning, regular visits, analytics and continuous optimisation.
TECHNOLOGY PORTFOLIO
There is no universal unit for every water source. We select the treatment sequence from the analysis, required flow, target quality, available space and total life-cycle cost.
Equipment protection and turbidity stabilisation before sensitive process stages.
Removal of parameters that interfere with the process or shorten equipment life.
Controlled process and feedwater quality for demanding applications.
System protection matched to water chemistry, metallurgy and operating regime.
Microbiological control with process safety and targeted product consumption.
Equipment and expert support that keep the program stable over time.
INTEGRATED SOLUTION EXAMPLES
These are not off-the-shelf packages or claims about individual customer references. Every solution is sized from water analysis, process conditions and plant objectives, with NTI responsible for integrating the technologies into one working system.
Scale, corrosion, biofilm and airborne solids impair heat transfer and increase water consumption.
A Solenis chemical program, AZUD side-stream filtration, a cooling tower or service package, plus NTI dosing, analytics and continuous supervision.
Hardness, dissolved oxygen, deposits and condensate contamination put steam-system efficiency and reliability at risk.
EU-manufactured water-preparation equipment for softening, reverse osmosis or EDI, Solenis boiler and condensate conditioning, plus NTI controls and performance verification.
Variable turbidity, dissolved substances and reuse targets require a stable sequence of pretreatment and final purification.
AZUD filtration, EU-manufactured membrane water-preparation equipment, Solenis chemical optimisation where required, plus NTI engineering, integration and commissioning.
INDUSTRIES
Every sector has different requirements for water quality, process reliability and compliance. We therefore build each program around real operating conditions.
Complete solutions for water preparation, treatment and reuse in manufacturing plants of every size.
Chemical water treatment for power plants, district heating, boiler houses, cooling and steam systems.
Reliable process, cooling and boiler-water preparation for demanding chemical operations and asset protection.
Water-treatment systems designed for stringent purity, stability and process-traceability requirements.
Water preparation and treatment for breweries, dairies, bottling lines and other food-processing plants.
Temperature control, filtration and stable water quality for polymer processing and mould cooling.
Cooling, solids removal, emulsion treatment, corrosion control and wastewater management in demanding production processes.
Low-conductivity water preparation for rinsing, cleaning and processes sensitive to trace minerals and particles.
Control of deposition, corrosion and water quality in water-source heat and closed energy circuits.
PARTNERS
We represent proven manufacturers covering chemical treatment, filtration, water preparation, microbiological control and process cooling.

Authorised industrial distributor for Slovenia and Croatia. A global leader in water-treatment chemistry, monitoring and control solutions.

Distributor for Slovenia and Croatia and a pioneer in the industrial use of disc filtration in both markets.
EXPERT RESOURCES
Explore how industrial water systems work or use our guided form to send the information needed for an initial technical assessment.
Expert guides to cooling and boiler water, closed loops, filtration, reverse osmosis, wastewater, foam control and equipment service.
Explore the Knowledge Centre →Choose the system or problem. The questionnaire adapts automatically and asks only what matters for your specific technical case.
Start a technical enquiry →HOW WE WORK
We study the system, take samples and analyse operating conditions.
We select the chemical program, equipment and control parameters.
We supply, install, tune and verify the system.
Regular visits let us track results and recommend optimisation.
EXPERT ANSWERS
Short answers to the questions we most often address during an initial plant review.
Evaporation concentrates dissolved salts, while the system receives additional contamination and microorganisms from the air. Conductivity and blowdown, scale, corrosion, suspended solids and microbiological growth therefore need to be controlled together.
An open system rejects part of its heat through evaporation and continuously receives new water and airborne contamination. A closed loop has no evaporative concentration, but may still corrode because of oxygen, unsuitable pH, glycol or process-water ingress.
Softening removes hardness ions but does not reduce the total concentration of dissolved salts. Reverse osmosis is used when the process, boiler or downstream treatment requires substantially lower conductivity and broader removal of dissolved substances.
From feedwater analysis, operating pressure, boiler type, condensate return, steam use and existing equipment. Only then do we define pretreatment, chemical program, dosing points and control limits.
Yes. Clean heat-transfer surfaces operate more efficiently, correct cycles of concentration reduce unnecessary blowdown, and stable feedwater quality can limit boiler blowdown losses and production downtime.
Frequency depends on process risk and dynamics. Critical parameters may be measured continuously, operating tests completed daily or weekly, and detailed expert analysis and system inspection performed under an agreed service plan.
Yes. NTI services cooling towers and can assess both the water-treatment and mechanical sides of the system.
Yes. NTI provides commercial and technical support in Croatia and Slovenia and, depending on the project, works across the wider South-East European region.
CONTACT
Need technical advice, a review of your existing system or a quotation? Tell us about your process and we will respond as soon as possible.
info@nti.siLožnica pri Žalcu 61
SI-3310 Žalec
Mon – Fri: 8:00 – 16:00
CONTACTS IN SLOVENIA
For water-treatment technologies, chemical treatment, electrical engineering, process equipment and sales in Croatia, contact the responsible specialist directly.
Ložnica pri Žalcu 61
SI-3310 Žalec
VAT number: SI16350502
Registration number: 3713407000
Bank account · Banka Sparkasse d.d.
SI56 3400 0101 1525 191
univ. dipl. inž. kem. tehnol.
denis.guzvic@nti.siuniv. dipl. inž. kem. tehnol.
vesna.cesnik-kolenc@nti.sidipl. inž. el.
matej.blazinsek@nti.sidipl. inž. str.
marko.vivoda@nti.siSales Manager for Croatia
vanja.santak@nti.si