The Hygowater system is a water treatment unit designed to produce active chlorine for the disinfection of Dental Unit Waterlines (DUWLs). It aims to reduce water bacteria, including Legionella, by generating active chlorine from sodium chloride through electrolysis. The system ensures the quality of processed water is equivalent to drinking water standards, adhering to WHO Guidelines for Drinking-Water Quality and EU limits.
Function Description:
The Hygowater system processes water by first passing it through a pre-filter, which removes particles and bonds certain chemical compounds using activated carbon. The water then enters a disinfection chamber where electrolysis converts salts into chlorine. A special reaction zone eliminates any remaining germs, and a downstream ultrafilter further filters the processed water before it reaches the dental treatment unit.
When combined with the Hygowater Booster, the system can centrally treat larger volumes of softened, filtered, and disinfected water, supplying up to six treatment units. In this configuration, the Hygowater Booster connects to the Hygowater's water drain and filters the processed water through two ultrafilters before it reaches the treatment units. If a Hygowater Booster is connected, the Hygowater unit itself does not require an ultrafilter.
Important Technical Specifications:
Hygowater:
- Electrical Data:
- Rated voltage: 110-230 V AC
- Max. power consumption: 368 W
- Fuses: 2 AT for 230 V AC
- Protection class: II
- Internal voltage supply 1 (electronic module/valves): 12 V DC
- Internal power supply 1 (electronic module/valves): 5 A
- Internal voltage supply 2 (electrodes): 6-24 V
- Internal power supply 2 (electrodes), up to: 4 A
- General Technical Data:
- Dimensions (H x W x D): 452 x 166 x 430 mm
- Approximate weight (without pre-filter and water): 5 kg
- Approximate weight during operation: 9 kg
- Ambient temperature: 10-35 °C
- Inlet pressure: 1.5-6 bar
- Outlet pressure: 2.6-2.9 bar
- Water flow rate: 1.5-2 l/min
- Classification: Medical Devices Directive (93/42/EEC) Class I
- Electromagnetic Compatibility (EMC):
- High-frequency emissions: CISPR 11 Group 1, Class B (Compliant)
- Interference voltage at power supply: CISPR 11:2009+A1:2010 (Compliant)
- Electromagnetic interference radiation: CISPR 11:2009+A1:2010 (Compliant)
- Immunity to electrostatic discharge: IEC 61000-4-2:2008 (Compliant)
- Immunity to radio-frequency, electromagnetic fields: IEC 61000-4-3:2006+A1:2007+A2:2010 (Compliant)
- Immunity to electrical fast transients/bursts – AC mains: IEC 61000-4-4:2012 (Compliant)
- Immunity to surges, line-line and line-earth: IEC 61000-4-5:2005 (Compliant)
- Immunity to conducted disturbances, induced by radio-frequency fields – AC mains: IEC 61000-4-6:2013 (Compliant)
- Immunity to voltage dips, short interruptions and voltage variations: IEC 61000-4-11:2004 (Compliant)
- Immunity to electrical fast transients/bursts – I/O, SIP/SOP ports: IEC 61000-4-4:2012 (Compliant)
- Immunity to conducted disturbances, induced by radio-frequency fields – SIP/SOP ports: IEC 61000-4-6:2013 (Compliant)
Hygowater Booster:
- Electrical Data:
- Rated voltage: 110-230 V AC
- Max. power consumption: 78 W
- Fuses: 2 AT for 230 V AC
- Protection class: II
- Internal voltage supply 1 (electronic module/valves): 12 V DC
- Internal power supply 1 (electronic module/valves): 5 A
- Internal voltage supply 2 (electrodes): 6-24 V
- Internal power supply 2 (electrodes), up to: 4 A
- General Technical Data:
- Dimensions (H x W x D): 452 x 176 x 430 mm
- Approximate weight (without pre-filter and water): 6 kg
- Approximate weight during operation: 10 kg
- Ambient temperature: 10-35 °C
- Outlet pressure: 6 bar
- Water flow rate: 4 l/min
Usage Features:
- Automated Operation: Once connected to power and water, the unit automatically supplies water as needed by the treatment unit.
- User Interface: Features a function indicator, OK button, cleaning button, and reset button.
- Readiness Indicator: The OK button flashing green or lit constantly indicates the unit is ready. A flashing function indicator signifies the electrolysis process is underway.
- Visual and Acoustic Signals:
- OK button green: Unit ready.
- Function indicator lit: Electrolysis underway.
- OK button flashes green: Water tank filling, temporary no water.
- Cleaning button blue: Cleaning mode active (ends automatically after 30 mins or manually by pressing again).
- OK button red (constant beeping): Water leak or sensor fault (disconnect from water supply, unplug mains).
- OK button alternately flashes red and green (beeping hourly): Pre-filter worn (replace pre-filter).
- Daily Hygiene Tasks: Requires rinsing all extraction points (transmission instruments, multifunctional syringes, ultrasonic handpieces, cup filler) for about two minutes at the start of each working day to reduce biofilm accumulation. Transmission instruments should be removed before rinsing.
- Self-Clean Function: Activates a more powerful disinfection process by adding a higher concentration of chlorine. This mode is initiated by pressing the cleaning button and runs for 30 minutes, or can be manually cancelled. After self-clean, pipes must be rinsed until chlorine levels are below permitted limits, verified with test strips.
- Chlorine Content Measurement: Recommended weekly using chlorine test strips from one of the instruments after rinsing. Measured values should be recorded.
- Low Content (<0.2 mg/l): Start self-clean, drain 400 ml, re-measure. If still low, contact Customer Service.
- Optimum Content (0.2-1.2 mg/l): Normal operation.
- High Content (>1.2 mg/l): Normal during self-clean. End self-clean, drain 400 ml, re-measure. If still high, contact Customer Service.
- Pre-filter Replacement: Indicated by alternating red and green OK button and hourly beeping. The pre-filter should be replaced within six months at the latest to prevent damage. A small amount of water may leak during replacement, so a cloth should be placed underneath. The old pre-filter is disposed of as residual waste. After replacement, the pre-filter counter is reset by pressing the reset button for five seconds until three audible signals are heard.
- Fuse Replacement: The fuse is located on the back of the unit. An appropriate tool is used to release the fuse holder, and the fuse is replaced with one of the same type as per technical data.
Maintenance Features:
- All maintenance work must be performed by a qualified expert or Dürr Dental Service Technicians.
- Before any work or in case of danger, the unit must be disconnected from the mains.
- Hygowater Maintenance (Once a year):
- Advanced function test.
- Advanced test on water parameters.
- Replacement of the ultrafilter (8500200002).
- Replacement of the nonreturn valve.
- Replacement of the solenoid valves.
- Replacement of the flowmeter.
- Hygowater Booster Maintenance:
- Once a year: Replacement of the ultrafilter for the Hygowater Booster (8500200005).
- Every 2-5 years (depending on connected treatment units): Replacement of the pumps.
- Cleaning Outside Surfaces: Regularly clean with a soft cloth and neutral cleaning agent with water. Standard alcohol-based disinfectants can be used. Avoid pressure washers and harsh solvents near display elements.
- Water generated by Hygowater is not suitable for drinking.
- Do not use the system for more than two dental treatment units without corresponding accessories to avoid filter blockage and operational stops.
- Maintain short and straight water systems to ensure effectiveness.
- Ensure timely servicing/replacement of pre-filters/ultrafilters. Hard water reduces disinfection efficiency.
- Do not exceed recommended water pressure (6 bars) to prevent burst pipes and flooding.
- Regularly verify chlorine content (weekly) in water from transmission instruments or cup filler.
- Only use water; do not use other liquids or operate without filters.
- Keep the unit perfectly upright to prevent leaks and damage.
- The system operates with low chlorine content (0.2-1 mg/l), but some materials are not compatible with oxidative disinfectants. Ensure dental treatment unit is suitable.
- Do not use Hygowater with other disinfection systems simultaneously.
- Avoid operating in rooms with inflammable mixtures (risk of explosion).
- Additional devices connected must conform to IEC or ISO standards.
- Observe ESD precautions: switch off operating voltage, earth personnel during installation/assembly.
- Comply with all applicable guidelines, laws, and regulations.
- Do not convert or modify the unit.
- Installation, readjustments, alterations, upgrades, and repairs must be carried out by Dürr Dental or approved personnel.
- Connect only to mains power with protective earthing to avoid power surges.
- Only authorized staff may open the unit (except for pre-filter lid removal).
- Comply with electrical safety regulations.
- Never touch patient and unshielded plug connections simultaneously.
- Replace damaged cables/plugs immediately.
- Power outlet must be easily accessible.
- Maintain minimum distance of 30 cm from other electronic devices and mobile radio devices to ensure EMC.
- Use only Dürr Dental approved parts and accessories to avoid negative EMC effects or erroneous operation.
- Do not stack the unit with other devices; if unavoidable, monitor for correct operation.
- Transport the unit empty and in its original packaging. Keep packing materials out of reach of children.
- Dispose of the unit according to EU Directive 2012/19/EU (WEEE).
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