Adding Salt To The Pool - BWT PRO A Notice D'installation Et Conseils D'utilisation

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
qualified pool professional).
!
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.
!
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 filter filled 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 overflows through the over flow
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 overflow), and the initial salt concentration (to be measured).
M = (Cf - Ci)×V
(kg)
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 filled 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 overflow 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;
!
IMPORTANT Do not turn the Chlorine generator on while the salt is dissolving.
42/88
2021/03 - Indice de révision : B Code : 29740
(m3)
TRAITEMENT DE L'EAU