Buyer questions · direct answers · selection rules
Water Treatment FAQ — Selection, Price, Process, Maintenance, Certification and Delivery
Quick answer
Most buyer questions fall into six groups: selection, price, process, maintenance, certification and delivery. Selection starts with a complete water analysis and a peak flow, not a product name. Price follows scope and feed quality. Process must match the contaminant. Maintenance is driven by consumables and logged performance, and lead time starts when drawings are approved.
- Question categories
- 6 Question categories
- Standard warranty
- 12–18 mo Standard warranty
- Typical skid lead time
- 15–30 d Typical skid lead time
- Export countries
- 100+ Export countries
01
How do you choose the right water treatment system?
Start with the water analysis and the demand profile, not with a product category. The three inputs that change the design most are source quality, required flow and the intended use. A restaurant at 2 m³/h on chlorinated municipal water needs a different train from a hotel at 10 m³/h on a hard well. Send all three together and the quotation can be specific rather than generic.
| Input | Why it matters | Example |
|---|---|---|
| Source and analysis | Determines pretreatment and process selection | TDS 1,200 mg/L, hardness 350 mg/L, iron 0.8 mg/L |
| Required flow | Sizes vessels, pumps and membranes | Peak 5 m³/h, daily 40 m³ |
| Intended use | Sets the quality target and disinfection | Drinking, cooking, boiler make-up |
| Site conditions | Power, drain, plant room and climate | 380 V supply, indoor room 6 × 4 m |
| Seasonal variation | Avoids under-sizing at the worst case | Turbidity rises in the rainy season |
02
What determines the price of a water treatment system?
There is no single price for a water treatment system because the scope is not standardised. Two quotations for 2 m³/h can differ because one includes pretreatment, a stainless frame, a PLC and commissioning, and the other is a membrane skid only. Ask for an itemised scope and compare like with like before comparing totals.
| Cost driver | Effect on price | What to confirm |
|---|---|---|
| Capacity | Larger pumps, vessels and membrane area | Design flow versus peak flow |
| Feed quality | More pretreatment and higher pressure | Complete laboratory analysis |
| Materials | Stainless versus FRP versus plastic | Wetted parts and frame |
| Automation | PLC, sensors and remote monitoring | Required control level |
| Disinfection | UV, ozone or chemical dosing | Point of use or distribution loop |
| Documentation | Drawings, test reports and manuals | Language and standard |
| Freight and installation | Distance, container and site work | Incoterm and installation scope |
03
Which process removes which contaminant?
Each process has a narrow job. Filtration removes particles; carbon removes chlorine and taste; softening removes hardness; RO removes dissolved salts; UV and ozone disinfect. No single device does all of them, and adding a process that does not match the contaminant wastes capital and operating cost.
| Problem | Process | Not removed by |
|---|---|---|
| Turbidity and sediment | Multimedia or sand filtration | Carbon alone, softener |
| Chlorine, taste and odour | Activated carbon | Sediment filter alone |
| Hardness and scale | Softener or antiscalant | Carbon, UV |
| Iron and manganese | Oxidation followed by filtration | Softener (partial), UV |
| Dissolved salts, nitrate, sulphate | Reverse osmosis | Filter, softener, UV |
| Bacteria and viruses | UV, ozone or chlorination | Filtration alone (partial) |
| Colour and organics | Activated carbon or ozone | Softener |
04
What maintenance does a system need each year?
Maintenance is mostly consumables and condition monitoring. The system log matters more than a fixed schedule: backwash pressure, differential pressure, permeate flow and conductivity tell you when service is due. A plant that records these four values weekly will catch most problems before they become failures.
| Item | Typical interval | Indicator |
|---|---|---|
| Cartridge filter | 1–3 months | Differential pressure rise |
| Carbon media | 12–36 months | Taste or chlorine breakthrough |
| Softener salt | Weekly to monthly top-up | Hardness leakage |
| RO membrane cleaning | 3–12 months | Flow down 10–15%, pressure up |
| RO membrane replacement | 2–3 years | Irreversible loss of rejection |
| UV lamp | 8,000–9,000 hours | Low intensity alarm |
| Ozone generator service | 6–12 months | Output and feed gas dew point |
Intervals are typical industry guidance; actual schedules depend on feed quality, duty cycle and site conditions.
05
Which certifications and factory tests should you ask for?
Ask for the certificate that matches the claim. CE and ISO 9001 are the relevant documents for this equipment: CE covers safety and electromagnetic compatibility, ISO 9001 covers the quality system. Neither is a drinking-water certification for a specific product. A national high-tech enterprise certificate and patents show development capability, not water-quality compliance. For a regulated supply, request a test report for the exact unit and check local approval requirements.
- CE declaration and marked nameplate
- ISO 9001 certificate with a defined scope
- Pressure test and functional test report
- Material certificates for wetted parts
- Wiring diagram, manual and spare parts list
- 12–18 month warranty terms in the quotation
| Document | What it covers | What it does not cover |
|---|---|---|
| CE declaration | Safety and electromagnetic compatibility of the equipment | Drinking-water quality or local approval |
| ISO 9001 certificate | Quality management system at the manufacturer | Performance of a specific unit |
| High-tech enterprise certificate and patents | Development capability and intellectual property | Product certification or water compliance |
| Factory test report | Pressure test, flow, conductivity and function checks | Independent laboratory certification |
06
How long do delivery, installation and commissioning take?
Standard skids usually ship 15–30 days after drawing approval; containerized and turnkey plants take 30–60 days depending on scope and component availability. Installation of a skid typically takes days, not weeks, once power, water and drain are ready. Commissioning covers flushing, membrane installation, pressure and recovery adjustment, conductivity verification and operator training. Allow extra time for customs clearance and inland transport.
- Lead time starts from drawing approval, not the order date.
- Prepare power supply, feed water, drain and access before delivery.
- Book commissioning after the plant room is complete.
- Keep spare cartridges, salt and lamps for start-up.
07
What information should you include in an inquiry?
A complete inquiry shortens the quotation and reduces the risk of a wrong design. Send the source, the analysis, the flow, the use and the site constraints in one message. If the analysis is not yet available, state the source and the known problems so the pretreatment can be discussed as an assumption rather than a guess.
- Source: municipal, well, river, lake, rain, brackish or seawater
- Analysis: TDS, conductivity, hardness, pH, turbidity, iron, manganese, nitrate, sulphate, chloride, silica and bacteria
- Flow: average and peak, in m³/h or m³/day
- Use: drinking, cooking, bottling, boiler, process or irrigation
- Quality target: TDS or conductivity, turbidity and disinfection
- Site: power, plant room size, drain, climate, skid or container
- Commercial: destination port, Incoterm, certification needs and timeline
08
How do you compare quotations from different suppliers?
Compare scope, not just the total. The lowest quote often excludes pretreatment, spare membranes, commissioning or a proper control panel. Use the same checklist for every supplier, ask for deviations in writing, and compare the five-year cost of ownership rather than the equipment price alone.
| What to compare | Weak quotation | Complete quotation |
|---|---|---|
| Feed analysis | Not requested | Complete laboratory panel |
| Pretreatment | Cartridge only | Multimedia, carbon and softener as needed |
| Membrane | Unbranded and undersized area | Brand, model, quantity and area stated |
| Pump | Unbranded | Brand, material and curve |
| Controls | Relay logic, no sensors | PLC, conductivity, pressure and alarms |
| Warranty | Not stated | 12–18 months with terms |
| Documentation and service | None | Drawings, manual, test report and commissioning |
FAQ
Frequently asked questions
Questions buyers actually ask during sizing and quotation. Answers match the specifications above.
01 How do I know which water treatment system I need?
02 Why do quotations for the same flow differ so much?
03 Does the price include installation and commissioning?
04 Can one system remove iron, hardness and salt?
05 Do I need RO if my TDS is below 500 mg/L?
06 What consumables should I budget for?
07 How often should RO membranes be replaced?
08 Which certifications come with the equipment?
09 What is the lead time?
10 Do you provide installation and operator training?
Next step
Send your water analysis, get a factory quotation
Tell us the source water, TDS, hardness, iron and daily demand. Factory engineers reply with a flow rate, process train and budget range within one working day.