As a rule the pH will be regulated at 7.4
The pH will be corrected with pH min. We recommend the use of 15% sulfuric acid, the
weaker the sulfuric acid and the more accurately the pH dosage will work
In the exceptional case that the pH drops below 7.2, it is best to bring it back to zone 7.2-7.6
by adding pH plus
As an additional safety measure, we recommend that you do not lower the suction cup to
the bottom of the canister. If something should go wrong with the dosage, the entire
canister of acid will not be pumped into the pool.
11.5) Rx SP(Redox SetPoint)
The redox is a measure of the chlorine content(oxidation capacity) of the pool
water. The higher the Rx, the higher the chlorine content.
At startup we recommend setting the setpoint to 700mV, in the same way as
described above for pH. After the first startup measure the chlorine content with a
color method. Adjust the setpoint for redox if necessary (decrease if chlorine too
high, increase if chlorine too low).
Regularly verify the function of the electrodes and settings by measuring pH and chlorine
content with an alternative method (color measurement e.g. Poollab ZWMX1060)). If
necessary, adjust or calibrate the set points of the installation.
The measurement of the oxidation force of the water is expressed on the device in mV .
For a chlorine measurement the chlorine content is expressed in ppm.
Below is a table showing the ratios between mV and pH and the corresponding ppm.
In salt electrolysis the addition of chemicals such as anti-algae, wall-cleaner, flocculant,
sedimentation products, sulphates, copper sulphate, extremely dirty water (chloramines),
electromagnetic interference and/or a non-ideal grounding can sometimes cause the redox
to become unmeasurable. In most cases, the redox then drops to very low values, while the
chlorine content is correct. This deviation is temporary, but can last for several weeks. At
this point it is advisable to use the "salty time" dosing method. The device will then not take
into account the RX setpoint.
Attention, this table is not absolutely correct. It is always necessary to determine the
chlorine content by regular color measurements, and then to adjust the redox setpoint
(higher RX setpoint = higher chlorine content and vice versa).
