BWT PRO A - ADDING SALT TO THE POOL

2021/03 - Indice de révision : B Code : 29740 TRAITEMENT DE L'EAU
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5. ADDING SALT TO THE POOL
Beforeaddingsalttothepool(usepoolgradesaltcompliantwiththestandardEN16-401),makesure
thatthevaluesofthewaterbalanceparametersarecorrect:
• pHshouldbebetween7.0and7.4
• Calcium hardness (water hardness = concentration of dissolved calcareous substances)
between100and250ppm
• TotalAlkalinityshouldbebetween100and250ppm
Makesurethatthecombinationwillresultinbalancedwater(TaylorbalanceorLangelierIndex,contacta
qualiedpoolprofessional).
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Important:IfthepoolwaspreviouslytreatedusingPHMB,makesurethatalltraceofthisdisinfectant
hasbeeneliminatedbeforestartingtheChlorinegenerator.
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Important:IfthepoolwaspreviouslytreatedwithstabilisedChlorine(trichloroisocyanuricacidorsodium
dichloroisocyanurate),makesurethattheconcentrationofdisinfectantinthewaterisnotabove30mg/L.
Iftheentirevolumeofwaterinthepoolhasnotjustbeenreplaced,measuretheinitialsaltconcentration
withsalttester.
Itmayoccasionallybenecessarytoaddsalttocompensatelossthatmaybeexperienceddueto:
• back-washingofthelterlledwithsandorglass
• degassingoftrichloramines(intermediateby-productsformedbyactiveChlorinereacting
withorganicmatter),thatarevolatile
• lossofwaterduetosplashing,oroccasionaloverowsthroughtheoverow
Measuretheconcentrationofsaltinthewaterregularly,andmakesurethatitdoesnotdropbelow3.5g/lfor
PROAmodels,andbelow1.5g/lforPROLSmodels.
Usetheformulabelowtocalculatetheamountofsalttobeaddedtothewater.
Theparametersthatneedtobetakenintoconsiderationare:thevolumeofwaterinthepool(donotforget
thebuffertankifthepoolfeaturesanoverow),andtheinitialsaltconcentration(tobemeasured).
M
(kg)
= (Cf - Ci)×V
(m3)
M=weightofsalttobedissolvedinkg
Cf=targetsaltconcentration,ing/litre(note:1g/litre=1000ppmormg/litre)
Ci=initialsaltconcentrationmeasured,ing/litre.Ifthepooliscompletelydrainedandthenlledwithwater
fromthemunicipalsupply,itmaybeassumedthatCi=0
V=volumeofwaterinthepool(includingthebuffertankifthepoolfeaturesanoverowfeature),inm3
EXAMPLE1:
• Poolcontaining100m3ofwater,withaninitialsaltconcentrationof1g/L(1000ppm),thetargetsalt
concentrationbeing4g/L:
• M = (4-1) x 100 = 300
• Add300kgofsalt
EXAMPLE:
• Poolcontaining50m3ofwater,initiallyempty,targetsaltconcentrationbeing1.7g/L:
• M=1.7x50=85kgofsalttobeadded;
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IMPORTANT DonotturntheChlorinegeneratoronwhilethesaltisdissolving.