Membrane electrolysis 500
Type 500 Membrane Electrolysis
High-performance water disinfection for large public outdoor pools, indoor pools, school swimming pools, and therapy pools.
technology
Maximum performance for large volumes of water
The EWT Type 500 membrane electrolysis system is the most powerful unit in the EWT portfolio and continuously produces up to 500 g of highly effective hypochlorous acid per hour from natural salt. Like the Type 250, it features a free-hanging cell mounted on a freestanding, factory-assembled steel frame, which significantly reduces on-site installation effort.
The system is connected to both the pool water and a fresh water line. The fresh water is used exclusively for production and is softened to 0 to 1° dH via a separate water softener; a pressure reducer lowers the inlet pressure to 1 bar to maintain constant conditions in the electrolysis cell. A pre-installed chlorine gas sensor ensures additional operational safety, and the hydrogen produced is vented to the outside in a controlled manner.
Rated power
500 g Cl₂ / h
Salt consumption
~ 50 kg / day
Here’s how it works
The Synthesis Cycle
From plain table salt to highly effective, crystal-clear bath water in three automated, safe steps.
1
Water Softening & Automatic Brine Generation
Incoming fresh water is softened to 0–1° dH by a separate water softener and processed into a saturated brine solution in the 210-liter storage tank using high-purity evaporated salt. Under continuous operation, up to 50 kg of salt is used per day.
2
Electrochemical Splitting
The brine is fed into the free-hanging membrane cell. Under precise direct current supply and strict spatial separation by the membrane, highly pure, germicidal hypochlorous acid is produced—up to 500 g of active chlorine per hour at a flow rate of 600 l/h.
3
Safe Injection
Using the injector principle, fresh active chlorine is introduced directly into the main flow of pool water. The suction is continuously monitored; if the flow falls below a minimum level, production shuts off automatically.
For professional large-scale operations
Areas of Application
Large Public Outdoor Swimming Pools
Reliable disinfection of large pool volumes, even during periods of high visitor traffic and significant seasonal peaks. Crystal-clear, odorless water without a pungent chlorine smell.
Large Public Indoor Swimming Pools
In large, heavily used indoor swimming pools, consistent air quality is crucial. Precise dosing prevents the formation of combined chlorine (chloramines) and thus eliminates the typical swimming pool odor—even under high demand.
School swimming pools
Consistent, reliable water hygiene for daily school, club, and competition activities—with reduced maintenance requirements and predictable operating costs.
Therapy Pool
The controlled synthesis process creates a mild environment that is gentle on the skin and eyes, free of chloramines and without excess salt buildup—ideal for sensitive user groups in large-scale medical and rehabilitation facilities.
Data Overview
Comparison of system sizes
| Parameter | Type 500 | Type 250 |
|---|---|---|
| Nominal output (active chlorine) | 500 g Cl₂ / h | 250 g Cl₂ / h |
| Recommended tank size | Public | Public |
| Water consumption in operations | 25 l/h | 12,5 l/h |
| Max. salt consumption (24h continuous load) | 50 kg/day | 25 kg/day |
| Electrical power consumption | 5,0 kVA | 2,3 kVA |
| Dimensions H x W | 2.010 x 1.020 mm | 2.010 x 1.300 mm |
Video-Tutorials
Learn everything about the professional installation, ongoing operation, and simple maintenance of membrane electrolysis systems in our detailed tutorials.
System Overview
Get to know all the key components of an EWT membrane electrolysis system.
Saltwater pools.
The system and its performance capabilities are specifically scalable and designed to meet the spectrum of your requirements.
Renewal of a facility.
Our systems are suitable not only for new installations but also integrate seamlessly into existing systems.
Further information
Downloads
All relevant documents regarding membrane electrolysis at a glance.
Frequently Asked Questions
FAQ on the Type 500 Membrane Electrolysis System
How often does the salt need to be refilled in a Type 500 membrane electrolysis system?
The Type 500 consumes up to 50 kg of salt per day in continuous operation. Thanks to the larger 210-liter salt dissolution tank, which holds up to 175 kg of salt, it does not need to be refilled daily despite the high throughput.
What is the difference between the Type 500 and the Type 250?
Both models share the same design, featuring a free-hanging cell mounted on a freestanding steel frame and a fresh water connection. With 500 g of active chlorine per hour, the Type 500 offers twice the rated capacity of the Type 250, a larger salt dissolver tank (210 liters instead of 90 liters), and a higher electrical connection capacity (5.0 kVA instead of 2.3 kVA).
Does the water smell like chlorine during membrane electrolysis?
Precise dosing prevents the formation of combined chlorine (chloramines), which is responsible for the typical pungent swimming pool odor. This makes the indoor environment significantly more pleasant, especially in large, heavily used indoor swimming pools.
For which applications is the Type 500 suitable?
The Type 500 is the most powerful EWT system and is designed for large public outdoor pools, indoor pools, school swimming pools, and therapy pools with high water volumes and heavy usage. For smaller public pools, the Type 250 is generally sufficient.
Does the Type 500 require a fresh water connection?
Yes. In addition to the pool water, the Type 500 is connected to a fresh water line. The fresh water is softened separately and brought to constant operating conditions via a pressure reducer.
Can the system be retrofitted into an existing pool?
Yes, the system is suitable for both new installations and retrofitting existing large-scale systems. The freestanding, pre-assembled steel frame significantly reduces the amount of on-site installation work required.
Technical Advice & Price Inquiry
Would you like to upgrade your filtration system to modern, chlorine-odor-free membrane cell technology, or are you planning a new pool project? Send us your configuration.