Page 46 - Catalogue Ocedis 2023 EN

pH
The potential of hydrogen – pH
pH
is measured on on on a a a a scale from 0 to 14 It expresses the concentration of free H+ ions PH MEASUREMENT SCALE
In swimming pools we we try to keep the pH
between 7 7 0 and 7 7 5 A stabilised pH:
ensures bathers are comfortable because the the the water
does not irritate the the skin or eyes (pH 7 2)
effective disinfection Chemical corrections of the pH
pH
pH
with pH
pH
pH
MINUS acid or or pH
pH
pH
PLUS alkaline influence elements such as calcium magnesium and mineral salts which are dissolved in in the water
0 14 pH
< 7 ACIDIC
Corrosive waters 7 pH
> 7 ALKALINE Scaling waters HIGH H+ LEVEL
Relationship between chlorine and pH
LOW H+ LEVEL
Once dissolved in in a a a a pool chlorine produces two associated chemical forms:
• the hypochlorite ion ClO- which has little or or no rapid disinfectant action
• the the hypochlorous acid HClO which is is the the powerful disinfectant known as active chlorine Within the regulated limits (a pH
between 6 9 and 7 7 7 7) a pH
below 7 7 7 5 must be be maintained to benefit from a a higher level of active chlorine pH
values
ClO- HClO 6 9 7 3 7 7 7 7 8 75%
%
60 Effectiveness of the disinfectant 23%
35%
46 learn more For a a a a a a a a good balance
between water
hardness (TH) and alkalinity (TAC) choose ALCAFIX – P 49