Home Reverse OsmosisZS-RO5 Under-Sink Reverse Osmosis (5-Stage)Membrane capacity75 GPD (≈ 284 L/gün)Stages5Water treatment and environmental technology · since 1998
Clean water starts with the right engineering
From the reverse osmosis unit in your kitchen to industrial plants treating 8,000 cubic metres a day, design, manufacture, installation and service come together under one roof.
27 yearsYears of experience
What treatment capacity does your home need?
27 years of experience
Zülal Su in numbers
Years of experience27years
Industrial references1.850+
Installed treatment capacity180k m³/day
Service points36
36Service points
Zülal Su Teknolojileri
We do not just treat water; we design it around the need
Zülal Su Teknolojileri began in 1998 as a small filter workshop in Gebze. Today a 12,000 m² plant produces reverse osmosis membrane modules, packaged treatment units and home appliances; 34 engineers and 120 service technicians serve all of Turkey. In every project we first analyse the water and then design a solution for the need.
- Our own manufacturing: membrane housings, control panels and packaged plants
- Water analysis in an accredited laboratory
- Spare parts at 36 service points and 24-hour response
From home to industry
Treatment Systems
Home Reverse OsmosisZS-RO5 Under-Sink Reverse Osmosis (5-Stage)Membrane capacity75 GPD (≈ 284 L/gün)Stages5
Home Reverse OsmosisZS-RO7M Mineralised Reverse Osmosis (7-Stage)Membrane capacity100 GPD (≈ 378 L/gün)Stages7
Home Reverse OsmosisZS-TL400 Tankless Reverse Osmosis (400 GPD)Membrane capacity400 GPD (≈ 1.514 L/gün)Reject ratio1:1
Whole House and SofteningZS-YM30 Automatic Water SoftenerResin volume30 LExchange capacity120 m³·°f
Industrial TreatmentZS-IRO2 Industrial Reverse Osmosis (2 m³/h)Production capacity2 m³/saatRecovery%60 – %75
Industrial TreatmentZS-IRO10 Industrial Reverse Osmosis (10 m³/h)Production capacity10 m³/saatRecovery%70 – %80
Packaged Wastewater TreatmentZS-MBR50 Packaged Biological Wastewater Plant (50 m³/day)Capacity50 m³/günEffluent COD≤ 30 mg/L
Home Reverse OsmosisZS-TU Countertop Hot-Cold Purifier DispenserTreatment capacity3 L/saatHot water93 °CWhy Zülal?
Measurable quality in every drop
01
Water analysis first
Hardness, TDS, chlorine, iron and nitrate are measured; the system is chosen for the real water.
02
In-house manufacturing
Control panels and membrane housings made at our Gebze plant for easy servicing.
03
Remote monitoring
Conductivity, pressure and flow are monitored 24/7 in industrial systems, with early fault alerts.
04
Water reuse
We cut water bills and discharge loads by recovering process water at facilities.
05
Three-year warranty
Three years on home units and two on industrial systems, with ten years of spare-part assurance.
Calculator
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Bottled Water vs Treatment Unit Cost Comparison
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Bottled Water vs Treatment Unit Cost Comparison
Compare annual costs of bottled water and a treatment unit and see how many months the unit takes to pay for itself.
Plants we built
Explore allTreatment Plants
Wastewater Treatment and ReuseBursa Dyeing and Finishing Plant Wastewater Reuse2,400 m³/dayAt a 2,400 m³/day plant, 60% of dyehouse wastewater returns to process water.
Industrial Process WaterTorbalı Dairy Plant Process Water1,200 m³/dayA 1,200 m³/day RO system supplying quality water for CIP and boiler feed.
Drinking and Potable WaterKırşehir Basin Union Drinking Water Treatment Plant6,000 m³/dayA 6,000 m³/day municipal drinking water plant with arsenic removal and ultrafiltration.
Industrial Process WaterBiga Combined Cycle Plant Boiler Feed Water3,600 m³/dayA 3,600 m³/day RO plus EDI line producing 0.1 µS/cm boiler feed water.
Wastewater Treatment and ReuseÇorlu OIZ Central Wastewater Treatment Plant8,000 m³/day8,000 m³/day for an organised industrial zone; treating wastewater from 120 factories.
Drinking and Potable WaterAnkara Çınar Medical Centre Water Systems360 m³/daySoftening, UV and dialysis-grade RO at a 300-bed hospital; 360 m³/day.End-to-end water management
Explore allOur Services
- 01Industrial Water TreatmentWith reverse osmosis, ultrafiltration, softening and deionisation we produce water of the quality industry needs.
- 02Wastewater Treatment and ReuseWith biological treatment, MBR and advanced treatment we bring wastewater to discharge limits and reuse quality.
- 03Home Treatment and ServiceReverse osmosis, whole-house inlet filters and water softening, including installation and regular filter replacement.
- 04Water Analysis and ConsultingPhysical, chemical and microbiological analyses in our accredited laboratory, with impartial advice on the results.
- 05Operation, Maintenance and Remote MonitoringPlanned maintenance contracts, consumables management and IoT-based remote monitoring.
- 06Turnkey Projects and EngineeringWe run a treatment plant from feasibility through performance testing as the single responsible contractor.
From analysis to service
The right treatment in four steps
- 01
Analysis
A water sample is taken and measured in the lab or on site.
- 02
Design and quote
Capacity, recovery and operating cost are calculated and a written quote is submitted.
- 03
Installation
Home units are installed the same day; industrial systems are commissioned in 2 to 12 weeks.
- 04
Service and monitoring
Planned maintenance, filter replacement and remote monitoring keep quality consistent.
Service
Book a filter change or maintenance
Choose the service, pick a day and time, and our technician will come to you.
- Periodic Filter Replacement (home)1 hFrom 1,450 TRY (filter set included)
- Membrane Replacement and Full Service1 h 30 minFrom 2,650 TRY
- Fault Diagnosis and Repair1 hFree diagnosis, parts extra
- On-site Water Analysis (TDS, hardness, chlorine)30 minFree
- Water Softener Service1 hFrom 1,250 TRY
Our customers speak
Customer Reviews
We have not carried a water bottle in four years. I book filter changes online and the technician comes the same day. The taste of the water really makes a difference.
Sevgi DalgıçHome customer, Kadıköy, IstanbulThe reuse plant cut our water cost by 38%. The project was completed in seven months as planned, and thanks to remote monitoring our downtime is almost nil.
Hakan TerzioğluPlant Manager, Marmara Dyeing and FinishingWe pull water quality records automatically at audits. The alarms and reporting have made our food safety team's work much easier.
Ayşe KarataşQuality Manager, Ege Dairy ProductsService Points
Your nearest service point
Water guide
View allWater Guide
20Oct2026Water and HealthIs reverse osmosis water healthy? A guide to minerals, TDS and proper useIt is true reverse osmosis reduces minerals, but what does that mean? Facts on mineral addition, TDS and…
16Oct2026Cost and EfficiencyBottled water or a treatment unit? Annual cost, convenience and environmental impactWe compare the annual drinking water cost of a family of four with bottled water and a treatment unit: cost…
12Oct2026Industry and EnvironmentWater reuse in industry: five steps for textile and food plantsHow do you start wastewater reuse to cut water bills and discharge fees? Survey, pilot, process selection and…
08Oct2026Home and MaintenanceWhen should filters be replaced? A maintenance calendar for a five-stage unitSediment, carbon and membrane filters have different lifespans. A maintenance calendar, warning signs and the…Our References
- Marmara Boya ve Terbiye
- Ege Süt Ürünleri
- Çınar Tıp Merkezi
- Kuzey Marmara Enerji
- Adaçayı Termal Turizm
- Güneydoğu Meşrubat
- Çorlu OSB Müdürlüğü
- Kızılırmak Havzası Belediyeler Birliği
Let us analyse your water for free
Book a water analysis appointment for your home or business and receive an impartial recommendation based on the results.