Impact of pH on chlorine water disinfection

Chlorine is a very frequently used element to sanitise water, but the impact of pH on water disinfection with chlorine is very important.

Depending on the strength of acidThe dissociation in water is higher or lower.

Homtiky -100 pH 6 in 1 Test Strips

Price: 20€.

Buy on Amazon

Fontee 240 pH strips

Price: 10€.

Buy on Amazon

ECENCE 2 Units pH Test Strips in Rolls

Price: 12€.

Buy on Amazon

These products are widely used to ensure that water is free from pathogens. These products dissolve in water to form hypochlorous acid (HClO). Hypochlorous acid is weak, so the dissociation of its hypochlorite ion (ClO⁻) is very significant. As a result, hypochlorite has very low disinfectant power.

The balance between hypochlorous acid (high disinfectant value) and hypochlorite ion (low disinfectant value) is highly dependent on the pH. As can be seen in the graph, from pH 6 onwards, the disinfecting power drops rapidly.

Before deciding which disinfection system to use it is important to know the nature of the water, write to us so that we can help you design the best disinfection system for your installation.