Detailed Information On The Orp Operating Mode - AQUALUX Dinotec Premium Installation, Use And Maintenance Manual

11. DETAILED INFORMATION ON THE ORP OPERATING MODE

The amount of chlorine required can vary depending on several conditions :
- Covered pool (by sheeting, cover or panels)
→ Small amount of chlorine required (due to absence of UV), but risk of excessive chlorine levels due to continual
production.
- Sudden rise in the number of people using the pool
→ Very large amounts of chlorine needed, but on a temporary basis.
- Indoor pool or sheltered pool
→ Reduced need for chlorine (because of low exposure to external pollution), but which tends to increase
depending on the frequency of use of the swimming pool.
Given this range of possible circumstances, it is necessary to manage chlorine production according to requirements.
The ORP operating mode allows you to react to each of these situations.
The ORP measurement (in mV), reflecting the oxidation (or reduction) potential of the water, is a major indicator of
the pool's water quality.
According to the WHO, an ORP measurement of 650 mV guarantees disinfected water that is itself capable of
disinfecting. Despite the use of this value as a reference, this can only be on a theoretical level, because ORP
measurements can easily vary depending on the following parameters :
- The pH
- The type of chlorine (stabilised or non-stabilised)
- The presence of dissolved elements that can affect the water (metals, phosphates, surfactants)
- The cleanliness of the filter
- The presence of stray currents
- presence of flocculants (as a deposit on the probes).
→ The ORP measurement : - is not a measurement of free chlorine levels.
→ The ORP measurement :
NECESSARY PREREQUISITES FOR THE ORP OPERATING MODE :
- The pH regulation
- Stabilizer level between 20 and 30 ppm
- Grounding of pipework into which the probes are installed (with the Pool Ground)
- No use of water from boreholes
- Installation of the ORP probe at least 30 cm before the cell
- Balanced water profile (free chlorine levels at 1 pmm, and pH at 7.2)
- ORP setpoint adjusted according to the ORP measurement displayed (a value between 500 and 700 mV can be
considered as correct)
→ When using a chemical (flocculant, waterline cleaning, sequestrant), check the ORP measurement before and
after use of this product. If the ORP measurement drops sharply, stop the ORP check for a few days, until the
effects of the product on the ORP measurement disappear.
→ Influence of chloramines on the ORP measurement :
measurement tends to decrease.
→ The use of sulphates is permitted, provided they remain at levels below 360 ppm.
→ The use of copper sulphates is strictly forbidden.
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ORP control in no case eliminates the need to regularly check free chlorine levels.
- varies according to free chlorine levels and all elements in the water.
as chloramine levels tend to increase, the ORP
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