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Annex: Electrolytic corrosion in swimming pools
Annex
Electrolytic corrosion in swimming pools
Electrolytic corrosion occurs when dissimilar metals in contact with each other create a
potential difference . When separated by a conductive substance, known as an electrolyte, this
difference creates a small voltage that allows ions from one metal to pass to the other .
Similar to how a battery works, ions transfer from the most positive material to the more neg-
ative material . If this voltage exceeds 0 .3 volts, the most positive material begins to degrade .
In swimming pools, this effect can occur as pool water serves as an ideal electrolyte, with
components like the filtration system, heating elements, steps, and lights providing the dis-
similar metals needed to complete the circuit . While these small voltages rarely pose a safety
threat, they can cause premature equipment failure due to corrosion .
Like oxidation corrosion, electrolytic corrosion can lead to the rapid deterioration of metallic
materials .
To prevent this type of corrosion, all metallic components in contact with pool water should
be bonded together using 10mm² bonding cable . This includes non-electrical components
such as metal filters, pump strainer boxes, heat exchangers, steps, and handrails .
It is highly recommended to retrofit bonding systems to existing swimming pools and spa
pools that may not already be protected .
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