Question 1

Does an EWT electrolysis system meet European quality standards?

Accepted Answer

EWT products are certified according to the EU Biocidal Products Regulation (EC Biocide Directives). Every delivered system includes an EC certificate in the operating manual. Furthermore, EWT has repeatedly been honored with the TOPRAS Award as 'Best Product Supplier' (1st place in 2021, 2022, 2024, 2025; 2nd place in 2023).

Question 2

What does "in-situ disinfection" mean?

Accepted Answer

"In situ" means "on-site". EWT systems generate the required disinfectant (active chlorine) directly at the point of use using standard table salt—without the transport or storage of hazardous chemicals. This improves safety and reduces operating costs.

Question 3

How does salt electrolysis fundamentally work?

Accepted Answer

In salt electrolysis, an electrical current triggers an electrochemical reaction in a saline solution. This produces free chlorine (as hypochlorous acid or sodium hypochlorite), which disinfects the water. Bacteria, algae, and other microorganisms are reliably eliminated. The quantity of disinfectant generated is scalable and can be tailored precisely to the required demand.

Question 4

Which disinfectants are produced by EWT systems?

Accepted Answer

Membrane electrolysis systems produce active chlorine in the form of hypochlorous acid, which is injected directly into the water circulation system. ECO-a systems (tubular cell electrolysis) produce a low-chlorate sodium hypochlorite solution, which is temporarily stored in a product tank and dosed as needed.

Question 5

What are the advantages over conventional chlorination?

Accepted Answer

Compared to purchasing sodium hypochlorite solution (liquid bleach) or chlorine gas, EWT systems offer documented advantages: no chlorine odor, no eye stinging, no mucous membrane irritation, no salinization of the pool water (with membrane electrolysis), no handling of hazardous chemicals, lower operating costs, and continuous, reliable disinfection.

Question 6

How do the EWT product lines differ from each other?

Accepted Answer

EWT offers two fundamentally different electrolysis systems: (1) membrane electrolysis (Types 24, 48, 100, 250, 500) and (2) the ECO-a system (tubular cell electrolysis, Types 75 to 4000). While both systems are based on salt electrolysis, they differ fundamentally in cell design, application area, and capacity range.

Question 7

What is the primary advantage of salt electrolysis over chlorine canisters?

Accepted Answer

Our EWT systems generate the disinfectant directly on-site from simple salt. This completely eliminates delivery bottlenecks, fluctuating market prices, and the risks associated with hazardous goods transport.

Question 8

Is an EWT electrolysis system suitable for my private pool?

Accepted Answer

Yes. EWT membrane electrolysis systems are designed specifically for private swimming pools. Models Type 24, 48, and 100 cover private outdoor and indoor pools, hot tubs/spas, as well as therapy pools.

Question 9

Do I still need to buy chlorine and pour it into my pool?

Accepted Answer

No. The EWT system continuously produces the required active chlorine on-site from standard table salt. You only need to refill salt periodically—no purchasing, transport, or handling of hazardous pool chemicals is required.

Question 10

Why does pool water normally smell like chlorine?

Accepted Answer

The typical 'chlorine smell' is not caused by chlorine itself, but by byproducts formed when chlorine reacts with organic matter (e.g., chloramines). Because the EWT system continuously supplies fresh, highly effective active chlorine in the form of hypochlorous acid, the water remains hygienically clean without producing unpleasant odors. Customers report no chlorine smell.

Question 11

Is the water gentle on the skin—even for children?

Accepted Answer

Yes. EWT water is exceptionally gentle on the skin and prevents eye and mucous membrane irritation. The systems are explicitly recommended for pools used by children or individuals with sensitive skin.

Question 12

Will my pool water become salty from the system?

Accepted Answer

No. A key advantage of membrane electrolysis technology is that no salinization of the pool water occurs. The salt is dissolved in the system's separate brine tank, and only the generated active agent is introduced into the pool—the salt itself does not enter the pool water in significant amounts.

Question 13

Can I operate both my pool and hot tub with a single system?

Accepted Answer

Yes. EWT offers an optional dual-dosing module for this purpose. It enables the simultaneous operation of two water circuits (e.g., swimming pool and whirlpool) using a single membrane electrolysis unit (Type 24, 48, or 100).

Question 14

Which system capacity do I need for my pool?

Accepted Answer

The required system size depends on pool volume, bather load/usage intensity, and pool location (indoor vs. outdoor). Please contact EWT or your EWT partner for an accurate technical sizing calculation.

Question 15

What is required to operate the system?

Accepted Answer

Essentially, you need: standard vacuum salt/table salt (no specialty pool chemicals), a power connection (230 V/AC for Types 24, 48, and 100), and a connection to the pool circulation piping. Types 24/48/100 connect directly to the pool water line and do not require a separate fresh water supply.

Question 16

Is the system easy to install?

Accepted Answer

The smaller units (Types 24/48/100) can be wall-mounted using optional wall brackets, with the salt dissolver tank positioned underneath—making it space-saving and installation-friendly. Installation is carried out by your pool builder or certified pool technician.

Question 17

What are the operating costs of an EWT system?

Accepted Answer

Operating costs depend on the selected system model, local electricity and salt prices, and daily run times. As a rule: producing chlorine via electrolysis costs significantly less than purchasing commercial liquid bleach.

Question 18

Are EWT systems certified and approved for municipal/public swimming pools?

Accepted Answer

Yes. EWT products are certified under the EU Biocidal Products Regulation (EC Biocide Directives). Each system is supplied with an EC declaration of conformity in its operating manual, providing legal certainty for operators of public facilities.

Question 19

Which commercial and public facilities are suitable for these systems?

Accepted Answer

EWT membrane electrolysis systems (Types 250/500) are designed for public indoor and outdoor pools, school pools, and therapy baths. ECO-a systems (tubular cell electrolysis) are also engineered for large public aquatic facilities. Additionally, EWT systems are used in municipal water features, fountains, public parks, and agricultural greenhouse irrigation.

Question 20

What capacities are available for commercial and public pools?

Accepted Answer

EWT offers two product lines for public facilities: – Membrane electrolysis: Type 250 (250 g Cl₂/h) and Type 500 (500 g Cl₂/h) – ECO-a tubular cell electrolysis: ranging from ECO-a 75 (75 g Cl₂/h) up to ECO-a 4000 (4,000 g Cl₂/h). This enables disinfection even for very large municipal facilities.

Question 21

How is the system controlled and monitored?

Accepted Answer

ECO-a systems feature an integrated PLC (Programmable Logic Controller) that continuously monitors and controls all operational parameters. Interfaces for external enable (On/Off), Modbus IP, and Modbus RS485 allow seamless integration into higher-level building management systems (BMS) or pool control systems.

Question 22

How is safety ensured in membrane electrolysis systems?

Accepted Answer

In Types 24/48/100, the electrolysis cell is submerged under water—preventing any risk of gas leakage into the room. Vacuum extraction is monitored continuously; production shuts down automatically if airflow drops below minimum safety thresholds. Types 250/500 include a pre-installed ambient chlorine gas detector.

Question 23

Can EWT systems be used for municipal fountains and public water features?

Accepted Answer

Yes. Numerous public fountains, water features, and public park installations already operate successfully with EWT systems, ensuring hygiene, reliability, and ecological sustainability.

Question 24

Which system model is right for decorative water features?

Accepted Answer

The ideal system capacity depends on the water volume, flow rates, and specific project conditions. Please contact EWT for dedicated project planning and engineering advice.

Question 25

Can EWT systems be utilized for greenhouse irrigation?

Accepted Answer

Yes. EWT designs water treatment systems specifically for greenhouses, engineered for maximum efficiency and minimal maintenance—regardless of water throughput. This protects crops with clean water and prevents biofilm formation in supply lines.

Question 26

Are EWT systems suitable and certified for hotel and spa operations?

Accepted Answer

Yes. Premium components and innovative electrolysis technology ensure cost-effective operation of wellness, spa, and thermal pools while guaranteeing gentle, irritation-free, and odorless water for guests.

Question 27

Which system do I recommend for specific planning projects?

Accepted Answer

Membrane electrolysis (Types 24/48/100): Recommended for private pools, hot tubs, therapy pools, as well as small commercial indoor/outdoor pools (up to 100 g Cl₂/h), especially when water salinization must be avoided.

Membrane electrolysis (Types 250/500): Suitable for larger public indoor/outdoor pools and school pools.

ECO-a (75–4000 g Cl₂/h): Designed specifically for public swimming pools with high chlorine demand, retrofitting chlorine gas facilities, and projects requiring flexible tank placement.

Question 28

Does membrane electrolysis cause pool water salinization?

Accepted Answer

No. Membrane cell electrolysis technology prevents the transfer of salt into the swimming pool water. This is a crucial differentiator compared to in-line flow-through cells, which require dissolving hundreds of kilograms of salt directly into the pool.

Question 29

Which communication interfaces are supported by the ECO-a system?

Accepted Answer

The ECO-a PLC controller supports external On/Off control, Modbus IP, and Modbus RS485 for seamless integration into central building management and pool control networks.

Question 30

Where can I calculate system sizing for engineering projects?

Accepted Answer

EWT provides an interactive sizing calculator for initial planning at www.e-w-t.eu/rechner. In addition, the EWT engineering team is available for custom project consultations and tailored solutions.

Frequently asked questions about membrane electrolysis

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