6.- MAINTENANCE
6.1. CHLORINE LEVEL CONTROL IN THE POOL
In periods of warm weather, it may be necessary to extend the daily operation time of the salt
chlorinator, since the generated chlorine decomposes more quickly in elevated water
temperatures and with the increase of the solar radiation. Chlorine demand (the amount of
chlorine required) also increases with the amount of swimmers using the pool (deriving in
greater levels of organic matter). In order to ensure that the chlorine production is correct, it is
important to regularly test the chlorine level of the swimming pool. If the chlorine reading is
low (below 0.5 ppm), increase the production level of the system with the key “UP” (increase
the ORP set-point value in
systems), and/or increase the amount of time per day that
the pool pump/circulation system (and therefore the salt chlorinator) is operational. On the
contrary, if chlorine reading is high (over 2.0 ppm), decrease the output power level with the
key “DOWN” (decrease the ORP set-point value in
systems), and/or reduce the
operating time of the pool pump. It is strongly recommended to distribute the operating time
of the salt chlorination system throughout the day and the night.
If appropriate chlorine levels are not detected in the water after a normal period of operation,
then it is necessary to verify that the system is producing chlorine by doing the following tests:
While the pool filtration is operational and the salt chlorination system is turned on, take
a sample of the pool water from the return inlet in the pool. The sample must be taken by
closing the test tube with the thumb until the test tube is just in front of the return inlet. This
way, we are sure that the water sample taken comes directly from the return inlet. Next,
using a pool water test kit, take a reading of the total and free chlorine levels in the sample.
Take another water sample from the most distant zone possible to the return inlets, and
analyse the total and free chlorine levels.
Compare both measurements (
vs .
).
If reading turns out to be much greater than reading , and the salt chlorination system
has been correctly sized based on the swimming pool capacity and its use level, then it is
possible that a destabilization phenomenon of the produced chlorine is taking place. In order
to avoid this phenomenon, ensure that there is 20-25 g/m
3
of chlorine stabiliser (cyanuric
acid). The destabilization process (decomposition of active- chlorine in the water) takes place
in a natural way due to insolation (sun radiation) and high water temperature.
If the total chlorine reading in sample
(return inlet) is much greater than the free chlorine
reading (indicating a high percentage of combined chlorine) then it would be expected that
the chlorine measurements in sample would be low (indicating disappearance of the
chlorine by reaction with the present contamination).
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