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There is no clear link between Rx and ppm chlorine, but usually an Rx of 700-750 mV
corresponds to a chlorine content of 1 to 1.5 ppm.
Therefore, the chlorine content should be checked at regular intervals at commissioning and
thereafter using a color measurement method (e.g. Poollab ZWMX1060). If it turns out that the
chlorine content is too high, the Rx setpoint should be lowered. If it is determined that the
chlorine content is too low, the Rx setpoint should be increased. If necessary, repeat this
procedure several times until the chlorine content remains constant between 1 and 1.5 ppm.
As an extra safety measure, we recommend that you do not lower the suction cup to the
bottom of the jerry can when starting. If something goes wrong during dosing, the whole can of
acid will not be pumped into the pool.
Read the safety instructions carefully before using chemicals.
Specification pH addition
Since pH + has been added to liquid chlorine, the pH value must be corrected with pH minus.
We recommend the use of 15%-30% sulfuric acid. Boe "weaker" the sulfuric acid, boe more
accurately the pH dosage will work.
In the exceptional case that the pH falls below 7.2, it is best to bring it back into the zone 7.2-7.6
by adding pH plus.
As an extra safety measure, we recommend that you do not lower the suction cup to the
bottom of the jerry can when you launch it
If something goes wrong with the dosage, the whole can of acid is not pumped into the pool
Read the safety instructions carefully before using chemicals.
Calibration and control chlorine /pH
The accuracy of the pH value and the chlorine content should be checked regularly (weekly) by
means of a thorough colour measurement (e.g. Poollab ZWMX1060).
Each system shall be calibrated at least once a year. In case of a long bathing season or if
there is a discrepancy between the colour method and the pH / Rx values, it is advisable to
carry out the calibration also every six months, i.e. twice a year. The procedure for
calibrating and setting the set point has already been described in detail above
