GENO-UV-75
Order no. 100117150000_en_054 Author: mal-mrie G:\BA-100117150000_EN_054_GENO-UV-75.DOCX
1 | Laws, regulations, standards
In the interest of good health, rules cannot be ignored when it
comes to the processing of pool water. This operation manual
takes into consideration the current regulations and stipulates in-
formation that you will need for the safe operation of your water
treatment system.
Among other things, the regulations stipulate that
•only approved specialist companies are permitted to make
major modifications to the water supply facility.
•That all contact parts are regularly maintained and preven-
tively serviced.
•That the operation manual and the maintenance schedule of
the system manufacturer are complied with.
The DIN standard 19643, the Ordinance on Pool Water, stipu-
lates the requirements regarding the pool water quality. The con-
centrations of the disinfectants dosed as well as the resulting by-
products are also indicated therein.
Note: The disinfection system GENO-GENO-UV-75 is designed
for the disinfection of pool water and must not be operated in the
drinking water sector. They are installed downstream of water
treatment systems.
2 | Disinfecting impact of UV light
UV light (ultraviolet) is light with a wavelength between 100 and
380 nm. These wavelengths are below the sensitivity limit (in the
invisible range) of the human eye.
For UV disinfection, the wavelength at
254 nm is of particular significance. This wavelength is emitted
by low-pressure mercury lamps, which are designed similarly to
normal fluorescent lamps.
The disinfecting properties of UV light are due to the fact that
light of a wave length of 254 nm is absorbed by the nucleic acids
in the genetic material of micro-organisms. The absorption of the
high-energy radiation results in the modification of the genetic
material (DNA resp. RNA) and leads to an incapability to repro-
duce.
The intensity of the room irradiation (light dose) required to inac-
tivate micro-organisms depends on the respective species and
population. Fungi, spores and algae require a much higher room
irradiation than bacteria and viruses.
In the technical regulation W 294 of the DVGW (German Associ-
ation of the Gas and Water Industry), the minimum room irradia-
tion was specified as 400 J/m². At this room irradiation, a reduc-
tion rate of 99.99 % for viruses and bacteria is achieved.
For further and more detailed information, please refer to DVGW
worksheet W 294-1.
